That sort of firewall is going to be really expensive to run, to the point that it's a financial DOS vulnerability. What is feasible is simpler algorithms that

That sort of firewall is going to be really expensive to run, to the point that it's a financial DOS vulnerability. What is feasible is simpler algorithms that emit alerts on a baseline pattern match, which then get routed to AI observers after some trigger threshold for mitigation. I wouldn't be surprised if someone has already deployed something like that, TBH.