I have no idea if a game can be "decompiled" but normally developers will use source code to port their game to Linux.
GOG on the other hand needs to ask for source code from publishers/developers in order to offer Linux compatible games. Otherwise, they will probably use a Wine "wrapper" instead. As you can see on our forum, Wine works really well with many PC games.
Where the heck did you find that video? I watching it now and may post it later in the forum.
If you are very new to Linux, its a good idea to keep "trialing" it one day at a time. Keep using Windows for games, and take some time going through a few guides for games that you own.
Feel free to suggest a game we have not already posted a guide for...
I love what you said about NSA! Anything Windows is at higher risk of getting spyware, malware, viruses and threats. There are also risks in Linux, but not so much because hackers are not targeting it as much.
But, as more people start using Linux there is a chance more threats will appear. Mac doesn't get a lot of threats, but DOES get them.
I have decided to slowly move from Windows because of the cost and I have found Linux gives a lot more freedom to do what I want with my Operating System. In Windows, if you want a tweak or program to change something, it always costs money.
I don't mind paying for games and productivity programs for Linux, but I love the capabilities, and freedom to tweak and utilize it the way I want. Now that more and more games are working, its a No Brainer for me!