It is their problem until the second they submit it, then it is the project's problem. You can lay the blame for the bad actions wherever you want, but the reality is that the work of verifying the legality and validity of these submissions if being abdicated, crippling projects under increased workloads going through ever more submissions that amount to junk. What is the solution for that? The fact that is the fault of the lazy submitter doesn't clean up the mess they left.