Is Github, being owned by Microsoft, really that much more trustworthy?

Yes because GitHub's business model doesn't directly rely on the violation of user privacy. It's just pay-for-features, afaik.

Github doesn't, but Microsoft has shifted from a software licensing company; they make most their money off of subscription services now I believe, but never forget that they added ad tracking and advertising options to their operating system, and only after a lot of pressure do they start your new system up with asking about what privacy invasions you will permit for the sake of advertising.

Thanks for the feedback. We've added those platforms that we believe are most popular for the majority of web users. In my opinion, the best solution would be something similar to what Solid (https://solid.mit.edu/) proposes. Unfortunately, they don't have much traction yet.