Cloudflare pricing introduces an additional dimension for when you're architecting software on top of them, but if you do it correctly, your product has the potential to be faster, cheaper, and easier to run than traditional solutions running on multiple geographically distributed VMs. You just can't approach them as if they're just another VM instance provider and expect a similar experience and pricing. What they do and price for is fundamentally different from that.
Iirc Argo and some other routing products are quite expensive.