How about creating issues and tagging the ones where PRs are welcome and inform everyone about this way of work? I understand the frustration, when someone come

How about creating issues and tagging the ones where PRs are welcome and inform everyone about this way of work? I understand the frustration, when someone comes one day to the project with tens PRs and most of them are missing the point of application or going way out of scope, that will surely make maintenance in the future problematic. Everyone's time will be saved by informing about contribution limits upfront.