agree with your view.. sometimes the "welcome" bonus is often used (HIT & RUN) and IMO is not very effective in increasing the interest of newcomers to stay on the site for a long time. bonuses for players who are the most active or play the most types of games can be an effective way to stimulate old players to stay afloat or make outsiders glance to join in..
Hit & Run for the gambler? I don't think that will work every time they try the new gambling site because it depends on the luck itself. If you are lucky, then yes, you can withdraw that money by winning some gambling games. But if not, you need to deposit more money and play more round, but that will be back to your luck again. The bonuses will be good marketing to invite more people to come, but sometimes, if people see that the bonuses are not good enough to attract them, they will not visit that website.
It seems to me that a similar strategy Hit and Run will use professional bonus abusers. Indeed, for beginners, the first victory, as a rule, only kindles the taste of the game.
But even instant luck will not allow you to withdraw bonus money, they will have to win back for some time, that's how casino bonuses are arranged. Otherwise, there would be significantly more abusers.
I do not mind wagering bonuses for a long time, but I would prefer that these bonuses be the more the longer I play, and not vice versa.