amok: I think you need to adjust the benchmark after the release of Megamagic.
Nope. Not for a game which was in the pipeline and accepted for release.
But for months old games, if you don't have a minimum of 15,000 owners on Steam (possibly 20,000 as its not clear how GoG treats a single Greenlight bundle), you will probably be rejected as being "too niche".
Amok, once again you want to cherry pick based on one GoG release. Take a look at the numbers for the vast majority of games GoG has rejected vs. the ones they have brought well after initial release. You would see the difference.
Rejected UnReal World
Owners: 4,960 ± 1,769
The Fall of the Dungeon Guardians
Owners: 6,290 ± 3,415
Starward Rogue
Owners: 6,102 ± 3,449
Accepted Dex
Owners: 23,307 ± 4,701
Thea: The Awakening
Owners: 52,579 ± 5,761
Barony
Owners: 20,668 ± 3,612
You'd also see they aren't taking games that have been bundled a bunch of times in the past few years either.
I guess some people just don't want to get it...