Indeed, and those artistics usually don't get a damm about platforms beyond getting exposure to their work in some form.
Walking the corridors of GDC(E), PAX seldom turns into discussions about OS and 3D APIs, rather business opportunies, publishing contracts, turning ideas into contracts.
Street musicians and art fair artists also do stuff big labels and architure societies don't care about.
That’s because most of the indie developers use Unity, and in there you can release a Linux binary in the click of a button (you don’t even need to have a Linux OS, cross-compiling is supported out of the box)
This is what the AAA publishers/studios think, because mostly they make games just for the money.
They don't really care for their customers and DRM usually doesn't work in Wine and hence 'the game doesn't work'.
The indie game dev crowd, with much less resources, certainly doesn't seem to have any problems (ideological or technical) with Linux releases.