Gambling is an industry for owners and for customers gambling is a game now it depends on which side you look at it from
What you said above all right can be called a career can also be called a troublemaker all possibilities can happen
But in general, gambling is not part of a career because it causes more problems than profits this reason can be admitted because almost all casinos make a profit.

Before choosing which book sites you are going to play with remember that not all of them have the very same terms and conditions.
It's better if you are going to check each of the bookmaker's terms and condition since you said you are going to deposit and bet high stake some of them might ask you KYC.
And some of them might confiscate your deposit if you violated any of their terms so be careful and check everything before depositing.

Might've been an ISP issue or something? Check if your ISP allows gambling in the first place or whether it has banned visits for sites like Gamdom. Or maybe your country is the one restricted itself? Idrk the restrictions for using Gamdom. You can go try out stake, roobet, and rollbit. I've personally tried the last two and I don't really have any problems with them, the first one is a pretty well known site and I've also used in way back then (not anymore though).