Yup, this is exactly my point. It's not the serverless architecture, something you set up on Hetzner yourself with OpenFaaS (https://github.com/openfaas/faas), that is to blame here but the insane pricing scheme for traffic.
On the other hand, if one could explain such causation, then I would be very interested in hearing about it.
Correct, but the effect on the wallet doesn't care if there is a causal relationship. And since my wallet is closer to me than a philosophical debate, the conclusion I reach in this case, is to move my site ;-)