Disclaimer: I don't have any formal infosec training; I'm just a nerdy guy that likes coding, Linux, and FOSS.
[...] my browser fingerprint is unique!
How is this possible? How to prevent it?
No clue why it does this in your specific case, so I'm not even going to attempt to answer that one.
As for the unique id, personally, I don't consider that to ...
Qemu can emulate hardware, so by using a Windows 10 clean install I should be able produce a fingerprint that is very common.
This is a wrong conclusion. Emulate is not Imitate. Emulate just means that it works enough like the device from the perspective of the OS, which usually does not mean specific timings, performance ... . Also qemu can only emulate ...
Reusing the same ssh host key on multiple servers is a security risk. If one server is compromised, the attacker can intercept all connections to your servers.
If the servers are administrated by another person, you should ask this person over a trused channel.
Trusted channels are:
Website with HTPPS and a valid certificate. for example github has ...