Either you're familiar with GPU pricing and being willfully ignorant, or you're not familiar with the pricing in which case let someone who is point out:
- "Datacenter" means it's comparable to Runpod's secure cloud pricing.
- A spot instance of an H200 under someone's living room media console wouldn't go for A100 rates.
$3.50 will also get you an H100 at a laundry list of providers people build real businesses on.
Certainly all better track records than fly.io, especially on a post where they explain it's not working out for them as an offering and then promise they'll keep it shambling along.