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I did not find this to be the case.

I set up a mail server with NixOS 5 times in a row with 5 different Hetzner Cloud IPs and each of them arrived fine at Google.

With fine you mean not in the SPAM folder the first time? That would be an improvement.

Also works for Microsoft services?

Yes, "fine" means not in Spam.

> Also works for Microsoft services?

No, Microsoft seems to have an allow-list for servers, and ban everything by default (the laziest of approaches).

But that's OK: Because Microsoft does it so poorly, Microsoft email users check their Spam folder all the time anyway.