.... yea, I agree.
If you're at-all concerned with DRM protections, it's probably better to use a service that is not reliant on making calls to an outside server. Thats not a comment on the factual accuracy of OP's experience, that's just common sense.
You need to set up a dynamic seedbox ip
I have this exact setup. You'll need to setup a bash script to update your client ip, since gluetun will periodically change servers
There are a couple forum posts walking through it, it's pretty simple
Ngl, $843M seems kinda low for something like this
It honestly depends on the network policies you're dealing with. Some employers have strict security and won't allow workarounds like vpns or proxies, and they really don't want you connecting the network to other unsecured ones.
That said, I'd try a personal VPN (not necessarily a proxy one, just one that can connect you to your plex server on a shared network). If that doesn't work, I really doubt it's a good idea to connect to your plex server from their wifi anyway. If that's the case, I would just download the media I want before I get to work