Hi there,
I was have a spam product reviews from some IP address. And when I checking it from abuseipdb.com I see the IP address is marked spam already. I want to suggest add some features for your next version.
Please add abusedb.com API support, and its will be check the visitor IP address, and automatically ban. It's will be easy but effective solution.

please look at their API plain:
https://docs.abuseipdb.com/#configuring-fail2ban