Edited. Not only have I read numerous reports of it both on this site and on Reddit, but it personally happened to me around 2022. The number of such reports that I have read is easily 12x that of AWS. In contrast, AWS or any other cloud never did anything like this to me.
This is risked if the CPU or another resource is using close to 100% for a couple of months. Hetzner likes customers that pay for what they don't use.