While we do love our new users - oftentimes spammers are 1 reputation users, simply cause they (clearly) don't get any votes.
While I do realise there's potential for abuse - it feels like a lower flag requirement for post deletion for 1 rep users, say 3 flags with an automatic mod escalation (so we can review) and an automatic posting ban for that class of post until review if a certain threshold of posts is met, say 2 feels like a decent idea.
We want a low barrier to entry but I feel like lowering the barrier to getting in trouble for bad behaviour would do a lot to mitigate bigger spam waves, since they'd need to generate more credentials, and its going to rate limit them.
We've had a few recent spam waves this would probably have helped with and it seems a measure that might work with existing tools to get rid of these spam faster.