They already do I think. See https://salsa.debian.org/public and https://about.gitlab.com/blog/2023/09/19/debian-customizes-c...

For the source code yeah, but not for the issue tracker. Debian's issue tracker is very archaic and annoying to use when needed.

I'm glad it's not just me. I've given up on bug reporting to Debian on at least ~two occasions because the email sent via reportbug simply wouldn't go through without any indication as to why. Fortunately somebody else was more successful and all got fixed.

I never understood why it has to be so clunky. Some people might like this old style e-mail workflow, but I find it irritating.