Romanul: It's sarcasm, rgnrk. They seem to have high standards for 4X games(just imagine how high if they rejected Thea) but really low ones for platformers. I'm not blaming GOG for releasing too many platformes, I'm blaming them that they don't release more of other genres.
Secondly, if customers "whine" that X game wasn't released on GOG that's hardly bad for GOG. If means we like the platform so much that we want to buy the game here and are frustrated that we have to use Steam (or others). That's a nice complaint to have I would think. If we didn't care about GOG we would quietly shop at Steam and never hear a word of complaint ever again.
I don't really know about their high quality standards. It's probably more about the perceived success of the title. Mainly sales wise. Or how they think the community will respond to it. With new games is always a gamble, but they've been wrong many times before.
And your take on platformers is unfortunally taking root among many others that don't particularly like the genre. And I think it's already reaching the powers that be, who might be wary of releasing them here anymore. It's already happening with P&C adventures, for what I noticed.
And I'm not complaining that people whine about some game they want and isn't released here. I'm right there with everyone else when that happens to a game I want. It's about people whining when a game they don't care about is released on GOG, as games aren't released at the expense of any other.