I don't think it's just a question of laziness but it's also a question linked to the fact that as a platform they are advertised on practically any site that has a reputation, this creates an aura of trust which rightly leads users to trust and deposit here.
Moreover they offer the chance to play in minor leagues with many odds available...all these factors lead people to play here and not make any search.
Whatever you stated effectively proved what I said. Those gamblers blindly believe these sites thanks to their popularity and don't bother to do their own research implying how lazy they truly are.
Smart gamblers do all sorts of research before gambling in any casino to make sure that they won't have any kind of regrets later on.