I think they're referring to the Enterprise sales where people have felt pressured to sign six- or seven- figure contracts after usage goes above a certain point. However, all the articles I've read on it are from companies using Cloudflare to do suspicious things with rotating domains through IP addresses, or doing things to try and get around service costs. It also seems like they give you months of warning and will try to convince you to sign up for Enterprise, they don't just shut things off. But their sales team seems to portray themselves as legal, support, or compliance teams sometimes so not exactly forthcoming in their approach either.

I'm a happy user of Cloudflare, but if you're using it for domain registration and hosting infrastructure, you need to see it as a single point of failure. Any account issues and you won't be able to point your domain to an alternate host while you work things out. Any service outage in CF systems will similarly lock you out of routing around the failure. It's better to have DNS off of cloudflare if they're handling your hosting services also. Or host elsewhere and only handle domains on cloudflare. Their domain pricing doesn't add any costs over the base registrar cost, so the latter is a reasonable option.

https://news.ycombinator.com/item?id=40481808

You could argue in that case it was a gambling site and it will never happen to you because you're not in a high risk category.

The scary thing for me is nowhere in their initial communications did they explain the issue they just demanded $120k upfront (refusing monthly billing).

The CEO who is usually active on HN didn't show up to give their side either, there's no way they couldn't have been aware of a 1044 upvoted post https://news.ycombinator.com/item?id=40481979

It's just traffic based: sales try to get you on a paid plan, or a higher tier. For some accounts they've given ultimatums ("pay for the higher tier by x date or we have to stop providing service"). But I believe those cases were e.g. online casinos doing specific things with the platform (say, evading national blocks on gambling websites) IIRC.