I think you misunderstand what an ad hominem attack is. If gmaxwell had called you are blithering fool, that would qualify. As it were, he pointed out that your posts have been incorrect and confused, and then backed it up with specifics. That's not attacking the man, that's attacking the content (which was full of errors and confused).

You might try answering gmaxwell's assertion that ratelimiting is, in fact, not an issue instead of merely stipulating that it is insoluble.

For my own part, I would question that there is a non-ephemeral identification of participants, namely by requiring the inputs first. The inputs would serve as an identification and if any problems were subsequently to arise, they could be blacklisted.