There have been quite a few spam questions over the past few months where it took sometimes days until they got removed.
Proposal
Implement an automated process that moves questions from the visible list to some hidden queue for investigation if marked by multiple users an inappropriate content.
To avoid that this process can get misused: Only include users that marked the question if they are not New Users but already on a certain level (to exclude fake users).
And just thinking:
Eventually request from New Users for their first few post some additional identification step when posting a question to make it a bit harder to automate posting such questions.