It is always interesting to read researches from specific data and topic that you're covering.

Consider also online gambling, it's a big industry for bitcoin.

Of course, but it's possible to count "on average" to look at the force balance. Sure thing, it's not possible for p2p transactions.

I am imaging something related to this https://prnt.sc/rznddv but about bitcoin, not about all online payments

Web hosting/Cloud also is one of the biggest industries using Bitcoin, and for a simple reason, Paypal isn't available in every country and a lot of people don't have a debit card.

If you look for this type of list (there are plenty of others) you can see that the major industries are generally online shopping, gambling, hosting, services.

I doubt the porn industry is using BTC a lot as we may think, probably a few bitcoiners but I don't think there are persons in this industry suddenly starting to use BTC because <insert anything>. Anonymity can't be a reason because I'm sure they don't really care about it

Exactly, banking and finance comes the first part for them because this is foremost important in human's life. I would appreciate their wonderful Invention especially on the development to avoid banks.

Also if the transactions made faster I am sure BTC will be the undertake banks and will become the dominator, however they have to focus on emerging economic markets to achieve more.

How can you gather accurate information about such research?
There are hundreds of websites that accept BTC payments,but most of them are really small and you have to search a lot,in order to find them.
The main online industries that accept BTC payments are:gambling,sports betting,adult,gaming and webhosting.
You should exclude banking from your list.I don't know about any banks,that accept cryptocurrency payments.

The companies with the highest Bitcoin turnover are exchanges, they're making huge profits from their trading fees since this is a very active market. Next will be gambling, there's a lot of Bitcoin casinos which deal with millions of dollars worth of Bitcoin. And that's pretty much it, all other industries are tiny compared to these two in terms of economic activity. Mixers would probably take third place.

Gaming? I mean, yea I understand that using an alias when playing but that's part of the game experience and doesn't really warrant you to becoming anonymous. If it was gambling then maybe, but it isn't really needed, especially in situations where the casino itself is legal. Additionally, it isn't really any leading type of industry but just more on finance and banking no? I mean, it's a digital currency after all. It's directly connected to any industry that is a part of something that requires payments and the like. It's kind of like a currency that could be accepted everywhere, as long as the other side allows it. The biggest industry affected currently though would probably gambling and shopping I think.