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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.

OP runs a casino/gambling site. Gambling is a regulatory mess (I have spent far too long dealing with this as an RNG supplier), and so it's very hard to comply with every jurisdiction, and each one needs you to prove compliance to operate in that jurisdiction.* Gaming companies spend a lot on compliance and tracking, but since the internet is the internet, it's pretty hard to enforce perfectly, so some countries and ISPs take this into their own hands.

Due to that, IPs hosting gambling and gaming sites often get regionally blocked by internet providers or otherwise flagged as hosting illegal content. Those regional blocks consequently affect the reputation score of the IP, and if you are a traffic aggregator like Cloudflare, can cause other customers to have issues. One of the most aggressive and annoying regulatory environments for gambling companies is the US, so it's very possible Cloudflare has had some trouble due to gambling use of their IPs in states in the USA.

Cloudflare wanted them to use the BYOIP features of the enterprise plan, and did not want them on Cloudflare's IPs. The solution was to aggressively sell the Enterprise plan, and in a stunning failure of corporate communication, not tell the customer what the problem was at all. The message from Cloudflare should have been "Enterprise plan + BYOIP or ban, and maybe we'll work with you on price" but it was instead "you would really like the Enterprise plan."