As for restricting access to files you could run them under a separate user account. User A shouldn’t have access to User B’s home folder. Although if its something that would need granted admin access I think it would have access to other users files again.

This happens on my Pixel as well. I forget which launcher I use but I keep the icon on my homescreen so I can just hold it to get the app info and force stop it.

Do they support port forwarding?

When you try to ping something on the internet do you know if the packets get dropped or rejected?

I was so close to trying out Flokinet. Glad I found this first.