I mean the server tools they have might not even run on your average PC/OS and even in that case not every buyer will be able to get in as no fan server will be able to hold that many players or whatever. So it might be enough for 200 people who want to play when the game inevitably dies but it won't be enough for every single buyer who will remember the game when he gets the chance to get a refund for what he bought 10 years ago and it's in all the news sites. Plus it won't be the game as they bought it still. Performance, simultaneous players handled by the server, etc. And nobody told you "if a kind fan soul is willing to invest in the game then you will be able to play" they told you you can play it. I've played Ultima Online in some of the better fan servers of whatever year that was in, it wasn't the game as I had bought it for sure, fun as it was with a tight community. So unless the game I bought was a game that was explicitly about the experience of playing it on varied servers with varied setups, content, rules, mods, capabilities, etc like say, a p2p customizable game like Minecraft, I'd still have a good case to consider it a "scam" if it devolved to that further down the line. I didn't buy theoretical options that demand a PC beyond what I play it on.
Edit: ok then since it wasn't meant to apply to MMORPGs and other such games. But there are also MMORPGs where it's not quite so clear that it's time limited since they may have the same exact demands and set up but go for different monetization models to sustain them with one-time payments, dlc, micro transactions, etc, nothing that explicitly limits your money with time. So then every MMORPG to avoid a lawsuit would have to be sub based rather than let people play it on their own terms with such options? Like Guild Wars which allowed anyone who bought it to play and was sustained by selling yearly expansions to its fans who needed to do that to access the new content? I mean I guess Guild Wars may still be online but it's all gonna go some day.
I mean I do wish all the FPS (and games of similarly simple set up) out there allowed fan servers (for real, not being limited to renting a still limited in options private server from whatever company the publisher chooses or directly from them, actually get the software and run it on your PC of choice and everything like you can for Counter-Strike and not even need the official master server on to find it, just type in the IP and get in) like in the good old days where it was the norm but I can't apply that to every online game, some do need to be run the way the company/creators wish to provide the experience they're selling.