Yep, it's against Cloudflare's ToS. It's a gray area as it seems you'll only get flagged for heavy use. Either way I would advise against it and use the alternative options you mentioned.
Edit: Revised ToS
Yep, it's against Cloudflare's ToS. It's a gray area as it seems you'll only get flagged for heavy use. Either way I would advise against it and use the alternative options you mentioned.
Edit: Revised ToS