Very cool tech. But ridiculously expensive. According to [1] you pay $5 per 10,000,000 requests, <10ms each. That works out to less than 27.8 hours of CPU time per month. And that's assuming near-perfect utilization of that 10ms window and ignoring upfront cost of Pro plan, which this is an add-on to.
Compare that to Linode/Hetzner/OVH/etc. where you get half-CPU for that money (i.e. 360 hours CPU time per month).
And yeah, sure. Not apples-to-apples. FaaS, infinite scalability, yadda, yadda. But computing http responses is still computing http responses. Is this FaaS magic dust really worth 1400+% premium?