Maybe we need open source credit scores. PRs from talented engineers with proven track records of high quality contributions would be presumed good enough for review. Unknown, newer contributors could have a size limit on their PRs, with massive PRs rejected automatically.
The Forgejo project has been gently trying to redirect new contributors into fixing bugs before trying to jump into the project to implement big features (https://codeberg.org/forgejo/discussions/issues/337). This allows a new contributor to get into the community, get used to working with the codebase, do something of clear value... but for the project a lot of it is about establishing reputation.
Will the contributor respond to code-review feedback? Will they follow-up on work? Will they work within the code-of-conduct and learn the contributor guidelines? All great things to figure out on small bugs, rather than after the contributor has done significant feature work.
We don't need more KYC, no.
Reputation building is not kyc. It is actually the thing that enables anonymization to work in a more sophisticated way.