There should be a HOWTO explaining the migration process from a forge to another. The pitfalls too.
Blender hired some Gitea devs to assist with their migration from Fabricator to Gitea. With Gitea getting federation folks might want to move to Gitea and should it fail(I hope it doesn’t), move out of Gitea.
What do you say we build a tool specifically for this purpose and offer services to migrate such parties? Your work on F3 should help us create an cross-forge data export that would help us both migrate to and off Gitea.