And it's getting worse. Even pFSense was struggling to keep up. If you are not on the free plan here's a way to block it in WaF:
Or if you want to be less draconian, e.g., allow Semisol workers above, apparently this is the correct WAF incantation:
https://community.cloudflare.com/t/how-can-i-block-2a063600-103-at-waf-level/651073/15