You really don't understand this? Games and art are only for entertainment or other pleasure or expression, so losing freedom with a game is far less of a loss than losing freedom with a tool.
As the story goes, RMS came up with the concept of "free" software when faced with a printer that wouldn't work. He had identified a bug in the driver but, without the source for that driver, was in no position to fix the bug. If the driver were free to be examined and modified, he considered, then he wouldn't be in the position he was. He didn't lose the ability to print because of closed source drivers, he lost the ability to print using the printer printer that he was using.
A specific game serves a specific function, regardless of whether it is "entertainment" or not. When you lose the ability to run that game, you have lost the ability to operate that very specific function, play that specific game. A printer driver, on the other hand, serves a generic purpose. When one fails, it is well within your ability to go and find a different printer that will perform the exact same function.
This is why I do not like the FSFs philosophy: I can use a closed source device and be perfectly happy with that forever. If the driver somehow fails, as it did for RMS and his printer, I will chalk that up to the risk I took going with a well supported closed driver vs a questionably supported (and don't try and convince me the open source drivers are consistently better supported than the closed, that's a whole different debate) open driver. So long as a feature comparable option exists, I have no say in whether a company chooses to open its drivers or not.
RMS didn't want free and open printer drivers, he wanted free and open printer drivers for the printer he already owned. From that he evolved to his belief that everything should be open and on that I fundamentally disagree: so long as there is choice, you should be free to make that choice, and no one should force anyone to do anything, nor think poorly of someone because their priorities differ from your own. You believe that free drivers are important, only buy hardware with as free of drivers as possible. That is not my priority and suggesting that I am wrong for not holding that same priority is conceited. If there was any suggestion of a threat to choice, that perhaps the day would come when all devices become necessarily locked down, then I would be standing beside you to prevent that from happening, but as it stands that doesn't look to be the future. In fact, more devices have open drivers now than ever before. That doesn't mean the companies that haven't at least got some support for free drivers are absolutely wrong, it is just a different priority level, and you have the freedom of choice not to use them.
Hopefully I've articulated myself well enough that a rebuttal is not necessary.