Right, Cloudflare is operating in good faith, and while the deal could change (because business is business and sometimes the offering has to change), one should ensure they have other options available for egress from origin. That's not a Cloudflare issue, that's a vendor risk management issue. You should always have alternatives planned if a vendor's specific offering at a price point is a material component of your business costs.

unmetered != unlimited

There might not be precise measurement system which bills you by the byte, but many provides monitor (or periodically sample) bandwidth utilization, so and using too much data will catch someone's attention.

Example from Hetzer, which claims to provide "unlimited" traffic. https://lowendtalk.com/discussion/180504/hetzner-traffic-use...

> We will routinely check your traffic use. If we continue to see such a high amount, we may choose to cancel your contract.