A Thing I Don't Get

Not five years ago, every media personality and NBA player was up the butt of social issues, wearing jerseys that said things like "Group Economics" and now those same people are basically shills for online gambling. Huh? And it's not like they're short money - I'm looking at Giannis, Bill Simmons, etc - these are folks with more money than they can spend in their lifetimes and so why are they in the pockets of online gambling? I find it very confusing.