If your antivirus software hammers the same website several times a second for hours on end, in a way that is indistinguishable from an "AI crawler", then maybe it's really misbehaving and should be stopped from doing so.
Personally, I'm skeptical of blaming everything on AI scrapers. Everything people are complaining about has been happening for decades - mostly by people searching for website vulnerabilities/sensitive info who don't care if they're misbehaving, sometimes by random individuals who want to archive a site or are playing with a crawler and don't see why they should slow them down.
Even the techniques for poisoning aggressive or impolite crawlers are at least 30 years old.
The only thing that seems to have changed is that today's thread is full of people who think they have some sort of human right to access any website by any means possible, including their sloppy vibe-coded crawler. In the past, IIRC, people used to be a little more apologetic about consuming other people's resources and did their best to fly below the radar.
It's my website. I have every right to block anyone at any time for any reason whatsoever. Whether or not your use case is "legitimate" is beside the point.
And just to not leave it merely implied, I don't give a rats ass if that slows down your "innovation." Go away.
Some antivirus and parental control control software will scan links sent to someone from their machine (or from access points/routers).
Even some antivirus services will fetch links from residential IPs in order to detect malware from sites configured to serve malware only to residential IPs.
Actually, I'm not entirely sure how one would tell the difference between a user software scanning links to detect adult content/malware/etc, randos crawling the web searching for personal information/vulnerable sites/etc. and these supposed "AI crawlers" just from access logs.
While I'm certainly not going to dismiss the idea that these are poorly configured crawlers at some major AI company, I haven't seen much in the way of evidence that is the case.