A ton of people using github barely understand the different between github and git and often think they are the same thing or that github and git are somewhat related more than they really are.

Bottles is pretty good. It’s available on flathub.

Google and other search engines can crawl lemmy just fine. The only downside is that the information will be split across domains unless google puts in a special case for lemmy/fediverse or something.

Email isn’t that secure anyway (don’t use email if your life or freedom depends on it), so I don’t see that as much as a downside.