I've had my issues with Meta concerning Pixelfed.
I get the skepticism, but they're working with devs from all sorts of fedi projects.
I'm surprised how they handled requests from smaller fedi projects, just like Mastodon's, always looking for a solution.
This might surprise some, but if you've used Mastodon in a browser, it's built with React, an open-source library from Meta.
Hopefully, this sheds light on the complex Meta/open-source relationship and why their recent actions are positive.