Very reasonable, in my opinion. PRs for features that will go unmaintained, have unexpected side effects due to AI not being capable of comprehending the entire codebase, or be able to guarantee their code isn’t ripped from a non-MIT licensed source, is a recipe for future disaster.
Better to put up reasonable barriers to entry so that committed community members can still get involved (who could possibly become the future maintainers of the project) while denying risky, low value contributions from statistical models trained on goodness knows what.