> Do I trust Microsoft more to protect my long-term interest than some unknown group of open source maintainers?

Do you? I don't. Microsoft is exclusively profit-oriented, they'll sell all your information in a heartbeat if they believe to have a legal way to do it and that it won't kill them in the next 5 years.

A group of open source maintainers (the more radical the better) will not. They will (usually) not polish the product as well, and they might be difficult to deal with if you found an issue (but you _can_ talk to them, unlike Microsoft).

I definitely trust open source people more, because they do their thing for ideological reasons and based on principles, not to maximize engagement and ad-spend and their yearly bonus.