I think there would be more sympathy if Cloudflare pointed to a specific limit breached and proposed ways to get into compliance at their current price plan.
"Service XYZ is now consuming 500% of expected quota. Shut it down or we need to get you on a bigger plan." is actionable and meaningful, and feels a little less like a shakedown.
I'm sick of "unlimited" services that really mean "there's a limit but we aren't going to say what it is." By that standard, freaking mobile telecoms are far more transparent and good-faith players!
Perhaps this also represents a failing in Cloudflare's product matrix. Everyone loves the "contact sales for a bespoke enterprise plan" model, but you should be creating a clear road to it, and faux-unlimited isn't it. Not everyone needs $random_enterprise_feature, so there's value in a disclosed quota and pay-as-you-scale approach: the customer should be eager to reach out to your sales team because the enterprise plan should offer better value than off-the-rack options at high scale.