That feature exists on cloudflare outside of using CF workers or their own compute stuff. It's part of their WAF featureset.
> If you are owner of this website, prevent this from happening again by upgrading your plan on the Cloudflare Workers dashboard.
Looking into it, my hypothesis is that the owners page is SSRd using cloudflare workers and they reached the daily limits.
And a few companies have been very successful in this effort.