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72% of devs believe Steam has a monopoly on PC games, according to study
(www.gamesindustry.biz)
Steam is a video game digital distribution service by Valve.
Steam News | Steam Beta Client news
Useful tools:
SteamDB
SteamCharts
Issue tracker for Linux version of Steam
Oftentimes, niche genre only can survive on platform with huge reach.
Releasing it only on DLsite or GOG means either they have to drive up the price to even cover the development cost. This often happen on niche Nintendo games or big budget R18+ on DLsite.
Some big budget games on DLsite can reach around 70USD, while when it gets released on Steam it's only 20-40USD.