I still use Invidious and Piped for searches and looking at comments, but they are currently broken (as far as I’ve seen).

I’m glad you mentioned the open infrastructure projects. For example, I use some of the few remaining nitter/invidious/etc. servers.

As for free software projects I suggest donating your time with contributions.

Definitely. I’m already spending much of my spare time doing this.

That’s a different question.