It took them 10 years to make Linux a competetive gaming platform.
They invested in VR early and still do a lot for this niche market.
They brought back hanfheld PC from being niche chinese devices to being mainstrean and maintain support for Steam Deck for 5 years.
As game developer I do find 30% cut abysmal, but it's not any worse than consoles and I dont like Epic as a gamer for being awfully anti-consumer. I certainly dont want PC game market to be controlled by chinese Tencent subsidiaries.
Valve rightly get a lot of flak for the gambling and high % cut, but you do get a functional useful service in return at least, that doesn't appear to be actively trying to screw you over