That simply isn't true. You can use our free service to run a business and many small businesses do. Larger businesses typically want things we only provide on the pay plans and therefore pay for the service.

That's good to know. The description of the free tier is a bit misleading:

  Free
  Cloudflare for Individuals is built on our global network. 
  This package is ideal for people with personal or hobby projects that aren’t business-critical.

Eh, seems like expectations management to me, i.e. "don't blame us if you do something business-critical on the free tier and it goes wrong and you didn't pay for support to get you out of it".

You say that, but if you don't need/want support and don't need any of their paid features, then it's free for business.

If I was a business, I would want to pay for support. That doesn't apply to all businesses I know.