I'm not worried. this is how new things begin. perhaps projects will start off using nostr alongside github and as usage grows on the nostr side, fully transition to only accepting issues and PRs over nostr.
@hzrd149 's noStrudel is just one example of a repository on the journey. its got 99 open issues and 4 open PRs on github and 5 open issues and 0 open PRs on nostr.
Issues and PRs raised on nostr get interest and engagement from across nostr and not just users using git specific clients. So the value proposition is quite different than self-hosted gitlab / forgejo.
GitWorkshop.dev
Decentralized github alternative over Nostr