It's a bull run, activities naturally rise as well. Why are you expecting the fees to stay low?

But this time around, yeah, the bullish market is probably driven mainly by institutions. Yesterday, the fees were as low as 2 Sat/vB for high priority transactions. So, I guess this is just a spike in the fees, a quick and temporary increase. Right now, the fees have decreased considerably. It might go north once more especially if the retail market goes active, but I'm seeing double-digit fees in a day or two.

Exactly!
Blame those #@%&$ runes.
If you look at the following block, it's full of op_return tx's:
https://mempool.space/block/00000000000000000002f0d74899067c194433712672955709375f0b56f23522

Only Ocean pool is doing something about it. Other pools swallow up the fees from those runes.

It is not just during bull runs but generally whenever there is a "large" price change (rise or fall) the traders start moving their coins around (some deposit and some withdraw from exchanges) therefore the increased number of on-chain transactions creates these temporary spikes.

Although it is hard to talk about the cause without actually going through the transactions in each block and analyzing them but I have to say there is a good chance that the recent fee spikes were because of the same ongoing spam attack as some others mentioned.
These are the same scammers who have been exploiting the Bitcoin protocol to inject arbitrary data into the chain calling it Ordinals, Runes, Tokens, etc. and that spam attack makes things worse and causes fee spike as well.

BTW you created this topic about 1.5 hours ago and right now mempool.space shows this as fees:

This is very common everytime price of Bitcoin rally. Even before, this was already the problem.
Take a look this all-time chart of Bitcoin Average Transaction fee, as you can see there's a huge spike every bull run season. Even before, around 2017-2018 bull run, we already experiencing this.

Hopefully, it would stay that way  
Some say it's because of the rally for BTC, some - because of the Runes (never got involved into 'em), but the fact remains.

Those articles are pretty interesting, thanks for them!
I did read them not at full (will do it later, appreciated), but, can't we call the Runes the same as the dust storm that swallows up the space for basically no good? 

These spikes usually result in high transaction fees when Bitcoin price changes significantly, pumping and dumping Bitcoin prices, and bull runs. This is because some traders are trading more bitcoins during this time as the exchange dollars are in and many traders are out.
 But I think trading following this Mempool saves a lot because now it is understood what kind of congestion is created, if there is more transaction pressure then the Mempool spikes but now the transaction pressure is very less at present due to which the fee is at a very low level.

A few hours later and I see you only need 2 satoshi per vbyte to get confirmed in next block. You know if you want to complain about high fees at least wait for it to be all day big fees or you're just crying wolf

I mean, I've heard it all before long ago.

What do you prefer. Owning a shitcoin worth $5 and fees equals to a few cents?

Or owning BTC worth 70k and paying fees of 10 cents? Because that's what it costs now.

The high fees don't feel normal for any of us, and, just like in recent months, we're seeing a temporary surge over a few days. The good news is, this time it only took a few hours before things went back to normal. So, when I see this kind of situation, I’m not too worried because I’m confident the fees will drop again soon.

But this trend definitely has an impact, especially if we adopt Bitcoin as a payment method. Let’s face it—no one’s willing to pay fees that high. This is why most people will continue to prefer fiat money for all their transactions instead of Bitcoin.