Agreed on many counts but they did collude (with Apple, Intel, Intuit, Pixar, Lucasfilm allegedly due to bullying from Apple) to suppress poaching workers from each other. I'd say Facebook played a huge role in refusing to collude (as can be seen from this exchange between Sheryl Sandberg and Jonathan Rosenberg [1]) and thus driving up worker wages due to competition.

[1] https://techcrunch.com/2014/03/24/sheryl-sandberg-facebook-r...

[2] https://news.ycombinator.com/item?id=34227388 - Steve jobs email asking Google to stop poaching from apple and them agreeing