(almost) nobody would dream of working for Facebook if the salaries weren't there. The "problem" with the games industry, and other industries with prestige jobs like publishing, film, etc., is that their toxicity derives from the drive of jobseekers to desire these jobs all out of proportion with their benefits and compensation. There's nothing inherent with the production of computer games that requires this attitude other than employees' and jobseekers' irrational (and very human) love of games. There are exploitative games that are bad, but there's no reason that all games have to be this way.
Facebook is toxic because it fundamentally makes money in an exploitative way that is bad. There is no way for Facebook to both be a business and not be sleezy. I think it's potentially possible we could build something Facebook-like as a non-business, but if we expect it to make a return for investors, it absolutely has to do fundamentally objectionable things to its users and society.