And I don’t think you understand OPs point. Of course you should be paranoid as a person like that, but most users aren’t targets. If you, as a regular user, get this paranoid about using computers, maybe you should evaluate your priorities.

Doesn’t matter, you are still effected by this issue since any images from communities you or anyone else on your instance follows get cached on your server, doesn’t matter if you actually looked at them or not. I would advise you to look into this if you are the instance admin and didn’t know this by now.

Depending on power prices in your country I would take that into strong consideration, while some server or desktop grade hardware might be technically very good, they often have high idle power consumption without offering greater functionality.

Take a look at this German Forum Post: https://www.hardwareluxx.de/community/threads/die-sparsamsten-systeme-30w-idle.1007101

They also have this google sheet: https://goo.gl/z8nt3A