I think once Forgejo gets ActivityPub integration working it will really help for migration. I know federated platforms like Mastodon struggled with adoption because I think a lot of folks struggled to wrap their heads around the fact that there's no "default instance" and they have to choose their own instance, but hopefully for a programming crowd that won't be an issue. It would massively help with the "well I could move to a different website but there's no obvious second choice I can move to" issue; you can just head to any Forgejo instance and interact with any other federated instance.