SQLite has a conceptually similar contribution process:

> the project does not accept patches from random people on the internet

https://sqlite.org/copyright.html

In their case, it's motivated by a desire to keep copyrighted code out of the SQLite implementation, but I'm sure it has a nice benefit of making it so that an extremely widely used project doesn't get drive by, low effort code review requests while still allowing the community to engage.

Asking that "random people on the internet" don't sent code is not altogether a novel, post-AI idea.