This could honestly break open source, with how quickly you can generate bullshit, and how long it takes to review and reject it. I can imagine more projects going the way of Android where you can download the source, but realistically you can't contribute as a random outsider.
I have an online acquaintance that maintains a very small and not widely used open-source project and the amount of (what we assume to be) automated AI submissions* they have to wade through is kinda wild given the very small number of contributors and users the thing has. It's gotta be clogging up these big projects like a DDoS attack.
*"Automated" as in bots and "AI submissions" as in ai-generated code