They do normally send out termination mails. You can see an example of one here (note the full month notice)

https://lowendspirit.com/discussion/comment/191966#Comment_1...

Would definitely be good to hear hetzners side of the story because all the cases I’ve seen thus far turned out to be a case of initial telling being understandably upset but leaving out crucial details.

They definitely are trigger happy with telling customers to find someone else & generally don’t elaborate on why