TL;DR: We've been on the Cloudflare Business plan ($250/month) for years. They suddenly contacted us and asked us to either pay them $120k up front for one year of Enterprise within 24 hours or they would take down all of our domains. While this escalated up our business we had 3 sales calls with them, trying to figure out what was happening and how to reach a reasonable contract in a week. When we told them we were also in talks with Fastly, they suddenly "purged" all our domains, causing huge downtime in our core business, sleepless nights migrating away from CF, irreparable loss in customer trust and weeks of ongoing downtime in our internal systems.
That it may well be, but it definitely falls on Cloudflare that they were able to take advantage of this for so long, and that the “unlimited traffic” was displayed as one of the perks in the Business plan (although I haven’t seen any evidence that that was listed). The decision to charge $10k a month would seem fairer if they weren’t insanely aggressive, and claimed there were violations of ToS where there don’t seem to be any.