1000 request/s is $0.05/s. 86400s/day * 30 days * $0.05 -> $129.6K/30d. 1k req/s is not that uncommon either. And that's before 'paid middleware'!
APIs and sites that'd truly benefit from this are immediately priced out.
I see why you priced it the way you did (gotta start somewhere with such a large upfront investment if you're not using cloud capacity), but you aren't exactly going to get any large customers with numbers like that. Project it to when you have ~500k req/s going through your service (778M ARR!): you cannot expect to still be making $0.05/1000 requests.
To put it into perspective, costs to call S3 are 10x-100x cheaper (GETs are 0.004/10000, PUT/POST/LIST/COPY is 0.005/1000) and S3 arguably does a lot more per request.
I really want to like it. The service sounds _awesome_, don't get me wrong. I'm a huge nerd for smart loadbalancing. I've written more loadbalancing code than I care to admit, but the economics just aren't there for me to even consider adopting your service. It's a lot cheaper for me to keep a pool of nginx servers in AWS regions around the globe with pre-established TLS connections back to the home DCs for much of the benefit fly.io brings.