Mhm, but not for hotspot, unless you're rooted or use a custom ROM with such feature. Otherwise best you can do is one of those hotspot apps that uses legacy Wi-Fi direct group and runs a proxy server, but that's still not as good.
Me neither, but I assumed it was because i've always ignored samsung "confirm updated agreement" since I bought the phone, a.d thought thats why i've been locked out of the few OneUI aspects i'm forced to use.
What do you mean, is it not possible? I use VPN with USB tethering just fine. Is the same not true for wireless hotspot? I assumed they work similarly.
It does for my OpenVPN connection. My laptop was able to remote to my home PC over my mobile data. Not sure if it works differently from commercial VPNs.
I haven't tested that, since the main point was for me to access my home network. I would assume it should look like I'm accessing Internet from home, but cannot confirm at the moment.