This was a concern in 2018 as well, and Newell dispelled it[0]. Newell supposedly holds >50% private equity in Valve[1], so he's the final say.

0: https://gagadget.com/media/cache/9b/6f/9b6f3304b05c9c98449db...

1: https://www.forbes.com/sites/davidewalt/2012/03/07/valve-gab...