Unlike other cloud gaming services like Geforce Now and xCloud , Stadia chose to use a platform which had very few existing native games i.e Linux. So it was in effect like the launch of a new console, since developers had to port their game to the new platform . But developers didn't have much of an incentive to since there weren't many users on Stadia. And users didn't have much of an incentive to use Stadia, since there were few games and their friends were on other platforms. It's a classic chicken and egg scenario.