Neobr10: Could you get a list of which games allow it? ...
I know Lineage II has many private servers, but as far as i'm aware for MOST games running private servers is illegal.
I've been playing some MMOs since Ultima Online and to be honest i have never seen a MMO that completely allows private servers. Yes, there are private servers for many MMOs out there, but most of them are illegal as far as i'm aware.
I know that at least Crossfire, PlaneShift, and Xonotic are completely free and unrestricted, both for clients and servers. Players can create and run their own servers without ever seeking permission from anyone. So just as with other DRM-free games, they will run forever - no one can ever prevent you from playing the game for any reason.
I'm not sure of the rest because I haven't played them. Regarding Lineage II - even if it allows private servers I don't think you allowed to run those servers without permission from NC Soft. And they can withdraw that permission at any time they like. So there's a big difference.
Neobr10: You missed the point completely. You're stretching things too far to make your point. Of course there are some methods that are obviously considered to be DRM by every sane person in the world (like always-online, SecuROM, Tages, or any other online activation system). What i'm trying to say is that it isn't always black and white. There's certainly a gray area when it comes to DRM. Some people consider multiplayer games with cd-key checks to be DRM, others don't. For me a game that requires an account for multiplayer only is not an example of DRM, for you it is. Can you see it? It's not a black and white issue.
But games that require an account for multiplayer means that part of the game will become unplayable once the publisher ends support for the game, just as it would for the single-player content. I understand if you don't care about multiplayer, so it doesn't matter to you whether multiplayer is available or not. But it obviously does matter to me and many others and I don't see why our desires shouldn't be taken into account.
This is especially important because now many games are being released in which the single-player and multiplayer are not distinct "modes" within the game (e.g. Titanfall). So it doesn't do anyone any good to say that a game has DRM only if applies to one part of the game or the other. Why not just have one consistent standard and be done with it? That way there is no confusion or debate necessary.
Neobr10: Oh, yes, there are many games released in the early 2000s that had a CD-key authetication without an account system...
Alright I didn't remember how those games worked; a CD-key/no account check for multiplayer is definitely less restrictive than an account requirement, since having an account carries many more privacy implications that a simple key check does not. It's all DRM, but there are different levels of severity of course. Regardless, even those games that did require only a key check are still going to be unplayable once the servers are shut down.
Neobr10: Nah, i'd much rather have Steam's DRM than SecuROM or Tages... I prefer Steam's approach which allows me to install and play my games in every PC i want without any restrictions. And i trust Steam's servers much more than the servers for SecuROM ad Tages. I know that Valve isn't going out of business anytime soon, but i certainly don't know what will happen to SecuROM and Tages now that no publisher uses them.
So you have different concerns when it comes to different types of DRM, just as with me and everyone else. I personally would care more about having to maintain an account because of the aforementioned privacy concerns that do not apply to SecuRom or Tages.
Keep in mind though, that it's not only a matter of whether a company like Valve "goes out of business" or not. As we have seen Valve, EA, and virtually every other publisher do, the EULA and Privacy Policy associated with these companies are updated regularly. If at any time you do not agree to those terms, you still lose all of your games whether the company is still in business or not. That is a much more insidious and damaging form of DRM than a simple authentication check.