I could argue the counterpoint for some of these places were commercial sex work (in Europe) is legal, there's an undercut of human trafficking that is quite problematic.
I can also argue that it is highly likely the individual who writes this post may look more like you than like me (even though some of the folks who looked like me ha e worked this angle to a similar degree of "success"). But that's a separate issue...somewhat.
Nothing in life is free. It's just a different type of work in my eyes, with its own sets of challenges. If done smartly, it can be lucrative, and if done foolishly, it just leads to an overploughed plot of land always looking for business.