are there really no stops in place to prevent something like "allanhit" signing up and the same day doing ~80 spam posts?
This kind of nonsense happened regularly on usenet, and was
not limited to the infamous Canter and Siegel.
There was a good solution: usenet readers had filters which allowed you to
completely ignore posts matching your chosen filter. "Completely" means "do not see this post nor any replies to it".
In that regard, usenet was an improvement on its successors.
Shame the "ignore subthread" filter doesn't work on this forum.