Indeed, there are many large casinos that have good reputations in this forum and we can choose them at any time, but we as gamblers must also have at least one of these casinos to make it the most favorite and most reliable casino because that way we can have the number of bets enough and can get a top VIP account rank which will be able to make us benefit from some of the bonuses that have been given such as weekly or monthly bonuses for VIP accounts.
If we as gamblers use all of these casinos then it will only make us confused and of course a little more difficult for us to have one casino that can give us more advantages.
You should first do a research on a new casino before using it to avoid unwanted things such as fraud.
Ultimately this comes down to your preferences, while it seems to make more sense to have a favorite casino in which you gamble most of your money so you can increase the amount and the rate at which you receive bonuses, this is not really for everyone, as doing this will probably cause the casino to at some point ask you to identify yourself, and while this is becoming less of an issue for gamblers there are still some people out there which prefer to remain anonymous if it is possible.
For myself, I don't mind if I play at my favorite casino and at one point they ask me to do a verification or a KYC.
Of course, I myself have a favorite casino that is trusted and big, so their reputation is also quite good, so I don't have to worry about my personal data being misused.
I have been reading and observing the gambling industry for quite a while so I know what is good and what is not good for myself when I am in this gambling industry.
Maybe it's true what you say that most gamblers prefer to remain anonymous when they are in gambling but I think that is their choice because there are also some casinos out there that don't ask KYC for each of their customers.