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I’ve been running a few VMs at Hetzner for years and never had anything like that. Are you sure this is Hetzner related?

I'm not sure. The timing could have been a coincidence I guess...

I've been a Hetzner costumer for years and I never got a single sms from them, let alone spam.

Never.

a great company to do business with.

No, and I have several accounts with them, both for me and for my clients.