Gambling indeed should be filling entertainment purpose but it happened to involve money on every bet which creates changes with our assumptions.
If only people could understand this and stick to it and not go trying to earn money through gambling which is technically not possible.
Trying out a new place, especially if it promises something better, is exciting, but it comes with a huge risk. Remember that new doesn't mean trustworthy.
Most gamblers join new casinos and platforms for the bonuses they offer, and they barely think about the risks involved which is indeed a mistake. They should evaluate the platform beforehand so that they don't get in trouble with their finances later on.
But quite a few gamblers also have accounts at several casinos and use them all to be able to have better opportunities but this can trigger an increase in the budget that we have set.
It's basically unnecessary to have multiple accounts at several different casinos, but if someone likes doing that, they can still manage to do that within the same budget if they know they won't go beyond their limits, they can simply divide the budget into all those accounts and stop when all of them get empty.