Plenty of family subscription services too (including for some of those your listed), although distance limits might come into play for some family subscriptions
The police regularly dismiss unfounded reports without additional action, it's how they're supposed to respond. They're not supposed to tell people "this thing you're doing is neither illegal or harmful and the people who got upset had to search for it to find it, but they did get upset so you should stop"
You need to set up a publicly accessible device (in this case the VPS) as your IPv6 gateway
So you set up your VPN connecting your network to the VPS (should probably be set up from the router) and set your router to advertise an IP adress for the VPS which is routable from your local network as the gateway address (and should probably also run DHCPv6 for your network)
(note, I have not set up this stuff myself so I can't help with implementation details)
Human involvement isn't the rule though. Again, that which ends up in fixed form has to carry expression by a human. Otherwise everything from dirt stains to footprints you accidentally create would be under copyright.
The prompts aren't generally considered enough because there's too little control over the final expression, the same prompt can create wildly different outputs.
The rule is already human expression in fixed form, of creative height. So you have to demonstrate that you the human made notable contributions to the final output.
Using stuff like controlnet to manually influence how images are shaped by the ML engine might count, there's some great examples here (involving custom Qr codes)
It's human expression that is protected by copyright. Creative height is the bar.
If you've done nothing but press a button there's often no copyright. Photography involves things like selection of motive, framing, etc. If you just photograph a motive which itself doesn't have copyright, then what you added through your choices is what you may have copyright of. Using another's scan of a public domain book might be considered fair use, for example (not much extra expression added by just scanning)
Independent creation is indeed a thing in copyright law. Multiple people photographing the same sunset won't infringe each other's copyright, at least not if you don't intentionally try to copy another's expression, like actively replicating their framing and edits and more.
Plenty of family subscription services too (including for some of those your listed), although distance limits might come into play for some family subscriptions