Take a look at this screenshot from Johoe's Bitcoin Mempool Site:


Note my mouse pointer: it's location is around the time I bumped this topic. Now read the bottom of the popup:
4+: 0.382 vMB
3+: 0.579 vMB
2+: 2.472 vMB
1+: 108.471 vMB

It's obvious 1 sat/vbyte won't be enough for a very long time. But with 3 sat/vbyte, your transaction would have been confirmed in the first block if it was found at this point. If a new block takes longer, fees will quickly rise and 3 sat/vbyte isn't enough. But even if I'd make a transaction that shouldn't take too long, I'd probably risk it with 3.1 sat/vbyte at this point.
The "2+" part is a bit tricky: you can't know if it's 2.0, or 2.8. So if you want to be on top of that, go with 3.1. If you can wait for the entire 2+ section to clear: use 2.1.

yes on days that we mine 160 blocks we empty mempool. On days we do 130 blocks mempool fills.

This is all luck-variance.  As 130-160 is not huge variance and happens often.

There are some three or more factors for it:

- Transactions increment during light hours in USA
- Transactions increment during Weekdays
- A lot of euphory for the bitcoin at 33-34 thousand $ USD
- Some business/developers misunderstand how bitcoin fees works

It's hard to tell without looking at the actual transactions (which I'm not going to do now). Johoe's site shows a steady increase in fees since yesterday, up to 30+ sat/vbyte now. It looks like this weekend isn't the right time to consolidate.

It could be anything, from funding hundreds of collectible coins to a bug in an automated system. This transaction paid $700 in fees, while just 2 days ago $12 would have been enough.
Being your own bank means you can make your own mistakes.

Bugs? Still? I don't think there are bugs, especially when this is not a new thing and as far as I understand, this problem exists since 2017. But I can be wrong, who knows. Usually bugs that drain your wallet, and especially as simple bug as bitcoin transaction fee is, is hard for me to imagine unfixed.

That's why centralized exchanges don't lose popularity despite the FTX case and many other cases where customers money was stolen.

That's correct!

Probably, you are right but isn't it better to test mixer when transaction fees are low instead of testing it when fees are very high? I don't know what to think.

This is getting ridiculous, yesterday, fees were 250 sat/vByte. Bitcoin's price is increasing and people are willing to pay more as price goes up. But here is the thing:
Look at this transaction: https://mempool.space/tx/416f3ebd1dab2ad43f481fbd9108573fa940818ad5dc77f9b552195e7a8ddb3b
I don't know if it looks like someone is testing a mixer but look, sender sent transaction with 110 sat/vByte and two hours later increased fee up to 1,188 sat/vByte while it was absolutely enough to pay 250 sat/vByte to get it included in the next block. At the same time, the sender sent $6205 worth Bitcoins and paid $1906 worth Bitcoins in fees. 1/3 of transaction was paid in fees, this is ridiculous.

I can't help but see this as a threat to Bitcoin. Am I correct to worry? It may be correct that storage space is cheap nowadays but I don't see any sense in that the Blockchain can be used to store arbitrary (non-neglible sized) garbage data at the cost of literally anyone using the network.

There's Lightning Network, sure, but high transaction fees aren't entirely unproblematic with regards to LN either.

Things like signature campaigns are becoming problematic. Being forced to use altcoins.

Who is buying NFTs? These ordinals? What's the point of minting them? What's the point of buying NFTs, I don't really get it, people are losing their mind. What's the point of paying hundreds, thousands and millions of dollars in something that can be copy/pasted and be viewed exactly as the original one? But here I talk about tens of thousands of people or even more. Oh my god, who buys this shit?

It's always been possible to store data in the blockchain, and there's always been spam. The main problem now is that someone managed to earn money from spamming, which means they can keep this up for as long as they can convince people to pay them for made-up BS Ordinals.

It's the same as it has always been: altcoins, ICOs, tokens, Forkcoins, Defi, NFT and Ordinals: they're all created because someone felt they were too late to get Bitcoin cheap, and created their own BS coin. It used to be pump & dump, nowadays it's hyping on social media. The creator gets rich, some other people earn a bit too, and many people lose their money. Greed and FOMO are great ways to lose your money.
After cashing in, they move to the next "project". Remember all those tokens that where going to "disrupt the xx industry"? It never happened! But someone got very rich out of it. Once "rinse and repeat" no longer works because everyone knows it's a scam, they come up with something else. That's how we got were we are now.
The list keeps getting longer. Ordinals is just the next phase.

I'd love to see it on the stock market, or for instance car registration. But that requires a central authority to connect crypto to the real world, and they're not ready for it.

If you consolidated your funds on time, you may be able to use ViaBTC's transaction accelerator now. But only for transactions up to half a kB, with at least 10 sat/byte (not vbyte, so about double for Segwit).