Microsoft is not just any huge, lumbering company, though. It has probably the best history of research of any pure software company (leaving aside IBM etc): Microsoft Research funded Haskell behind the scenes for years, they had a quantum computing unit in 2006, and already in 2018 were beating the field in AI patents and research:

https://www.forbes.com/sites/louiscolumbus/2019/01/06/micros...

Believing that OpenAI is MSFT's sole move in the AI space would be a serious error.

100% agree

If anything, the examples in that tweet shows the opposite. GitHub and Mojang both done lots of things that wouldn't happen if they weren't now Microsoft, especially GitHub which is only "GitHub" by name at this point, none of the original spirit is still there.