They are bizarre.
Hetzner is a German company. Credit cards may be common in the USA, but they're not anywhere else.
I’ve also had no problems using them in Britain, Canada, Ireland, Korea…
They certainly are very common in much of Europe. Buying stuff on credit might be not that common but plenty of people have credit cards themselves (even of they are effectively used the same way as debit cards)
To be fair not sure if you comment is just sarcasm.. but I’ve never had any issues using a credit card on Hetzner or pretty much any other European company
They look like "card tasting" payments which fraudsters do to check if a card is valid.
When I pay for something, now the other party has the money, that's how money works. If I trust them that little, I should probably be using escrow but this costs extra and so it imo doesn't make sense to pay that fee for every transaction - as one does with this chargeback guarantee thing. Probabilistic societies where you're excluded based on bad odds or credit scores is what you get with that system (I've been on the losing end of that, not because I've ever had any debt (too little money) but precisely because they had no positive data because I never needed a loan, and so you can't pay for stuff in certain countries because they require a credit card)
