Yes, this is the same situation. If you join casino just for gambling, you don`t think about this moments and when you hear about these bonuses it may be too late to get it. This is the difference between professional bonus hunters and simple gamblers. And i don`t think that casinos will change smth - they don`t want to give their money to someone if they can don`t give it.
The welcome bonus is of course only as a lure so that the casino site gets more players, not much different from a Demo account on a trading site, the bonus given certainly cannot meet the minimum requirements to make a withdrawal, it is likely that we have to make a deposit so we can bet more a lot to win the tantalizing jackpot provided by the related site. Professional gamblers will of course ignore this, what they are looking for is convenience and getting a fair and trusted site
There are professional bounty hunters yet. They registering in different casinos to get maximum rewards. I think that they have even a system how to cheat casino, different tables for analyze rewards and rules of getting rewards for different casino. I don`t know how good is profit but i don`t think that it is huge - in another way any casino would stop such situation.