Only one program can listen on a port at a given time usually. Something’s listening on port 443 (the standard HTTPS port), and when nginx starts up it tries to listen on that port and can’t. You can figure out what’s already listening on that port with commands like lsof or netstat, see here for examples:

https://superuser.com/questions/42843/finding-the-process-that-is-using-a-certain-port-in-linux

I don’t know exactly what you’re avoiding wireless for, but it has no ability to transmit, only receive FM if that matters. You could fairly easily disconnect/break the antenna and permanently disable even that.

The closest you’re going to find is probably the SanDisk Sansa Clip+. It can receive FM, but IIRC no wireless other than that. I don’t think it’s made new any more but you should be able to find it for less than £100 online.

I don’t think mutual aid can work well like that on the internet. Works great in person, works OK for GoFundMe-type stuff like “I had something happen to me that will take a lot of money to fix”. Too easy to scam and grift for small stuff like this though, where for all you know they’re just a very clever dog on the internet.