That’s the point here, though. The maintainers of Ladybird don’t want to be compelled to mentor people making throwaway contributions without a commitment to the project. It’s pretty frustrating to try to mentor an absentee mentee who isn’t actually ready to learn from you.
You make a strong point. Large parts of a decision like this have less to do with what you can get from the community, but what you have person-hours available to do with it. The core team is pretty small, and a lot of these automatically coded PRs are bound to be huge. They’re taking back their own time to focus on their own project.