This is a big concern to me, because I often turn on the VPN on both my PC and my phone, and while on the PC I use Firefox for pretty much everything, on the phone I constantly hop from Chrome to Brave to DuckDuckGo (and not Firefox). So if you think the solution is to remember to turn it off, you can forget about it, because I do forget about it, and will only realise when I turn on youtube and get an advert in a foreign language. So relying on my memory just won’t work.
Regarding public PCs, some of you might not know this, but 15 years ago (maybe more, I can’t remember right now), nUP was about to break when Melkor said internally he would quit. A few of us rallied behind a united dinner in a restaurant in Lisbon that we could all afford, and then walk to a café nearby with internet PCs to rent, so that we wouldn’t miss any turns when the queues would run out after dinner. This was a resounding success, and it really united us like we really needed it.
I’m not sure anyone would still need to do it now that we all have phones with bucketloads of internet allowances on top of wi-fi hotspots for anyone who did run out of internet allowance, but it does go to show that sharing a PC doesn’t mean cheating at all. On top of that I don’t know how universities are doing these days, but all of our university students also used to share computers between classes.
So by all means think things through, account duplicates and account “baby-sitting” is definitely a problem in Dark Galaxy, always was, and it definitely deserves everyone’s attention and concern, but we’re also living in the age of VPNs, so if all we have is a player’s IP geographical location, this game will be overrun by cheaters in just a few months after it goes public again, and we lost.