Huh, I tried to use their price estimator for my use case but it comes out the same for cloudflare pages + function and their goodies (D1, R2, DO, etc.) usage (around $5). But it is neat for in-between usage that is smaller than what cloudflare offers.
No, I bet it is some AI firm. nVidia is currently milking most of them dry and I would not be surprised if it is either Microsoft or Meta