[justincormack]

Its very hard to open issues or PRs etc on many self-hosted setups, as they don't have a way to create logins, or accept other identities.

[earenndil]

You can run gogs/gitea and get that basically 'for free'.

[huntie]

People don't really want to create an account for every project they send a patch to, and I say this as someone who does self-host.