You shouldn’t automatically trust open source code just because its open source. There have been cases where something on github contains actual malicious code, but those are typically not very well known or don’t have very many eyes on it. But in general open source code has the potential to be more trustworthy especially if its very popular and has a lot of eyes on it.
Yes. I got off reddit a while ago due to privacy and censorship issues on top of pushing/promoting content that annoyed me or I didn’t have any interest in. Been on the fediverse for a while and enjoyed that and was happy to hear there’s a federated reddit alternative.