probably not too big of an issue to worry a bout
As a relatively active StackExchange user, I think I can say with some authority that this depends crucially on the *volume* of such posts. Honestly, on StackOverflow, the volume of "low quality posts" that the community and mods already deal with is not a full order of magnitude away from "critical mass" of making the site a total cesspool of garbage. "Plz fix mai code plz" type questions with no useful content are just barely at a manageable level already. If this sort of content were to, say, quadruple, I truly worry that the sieves would clog, and the existing moderation would become a "what's the point?" sort of endeavor. As long as the AI is kept to a level that is significantly less than human users, this shouldn't be a problem.
remove these barriers by policy
The minimum wage in China is about $3/hr. This is the #1, #2 and #3 reason companies don't invest domestically.
The government is not some infallible entity that can magically solve problems like so many people seem to believe.
While this is true, you seem to be using this statement to insinuate that the government is incapable of or would have great difficulty regulating this. However, there is precedent going back centuries of governments successfully regulating gambling in some form or another. Furthermore, these days, gaming regulations are widespread, and enforcement is very effectively offloaded onto the gaming institutions themselves, freeing the government of essentially any involvement whatsoever, except for having to make the law in the first place. When you walk into a casino, after passing by all the kitschy shops, the first thing you will encounter is a bouncer checking your government-issued ID. This bouncer isn't hired by the government - they're employed by the casino! All the gov had to do was enact the law, and the market materialized a solution. Frankly, this is probably a prime example of how government regulation *can* sometimes magically solve problems like so many people believe.
Kleeneness is next to Godelness.