sed -i s/C/Rust/

You are now exempt from the rule please do not post

They’re functionally very similar but are two seperately developed pieces of software. The lemmy devs are tankies and many would prefer to completely avoid using something from them. I don’t believe there’s anything to worry about, as the devs can’t control individual instances.

The difference is just that you log on using two different sites. They can access the same federated content. Just read the rules of both instances and see if you prefer one or the other.