Again those linux builds are locally executable , the source code just makes room to run in a distributed calculation mode where multiple computers / CPUs / GPUs share the load evenly .These games will probably have to have some work done to support their (probably) Linux server infrastructure and custom hardware and GPU's.
It's not like they can let you download the binaries they use and away you go. Basically, if they wanted to allow this they would have to have a separate download for the PC version of the game. And that's pretty much the only place you'd be able to play most games. Most of the games on release don't have mobile ports.
So if you have an up to date linux distribution on your computer you could play them directly .