They appear to also have blocklists independent of "shit ton of traffic." I have a VPN to my VPS (Oracle), which has a public IP (and I'm the only user). I also get whoa pardner'd when going through that VPN.
Perhaps I fall into the "we don't want other people scraping our site unless they pay" category though. I would make sense to just block off all VPS/cloud IP blocks (e.g., AWS, Azure, Oracle, Google Cloud...).