I'm not expecting something for nothing, we all need to eat. I'm happy to stay within any limits or even have no free tier at all.
I just don't want the fear of waking up to a sales email one morning demanding I suddenly fork out more then I earn in a year off the project for an enterprise plan because I've exceeded their undisclosed thresholds.
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.
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 which also went viral elsewhere https://news.ycombinator.com/item?id=40481979