Cloudflare's business model appears to be wait till someone is generating lots of bandwidth and then give them 30 days to move up a tier or be closed down.

I've read reports of companies on the business plan being strong armed into signing Enterprise plans with 1 year upfront.

It's a listed company with revenue expectations, and VERY good at marketing itself, but it's free tier of CDN/DDOS to start off with is a good deal.

Move up a tier or move somewhere where it costs even more. That seems kinda reasonable, really.