Steam popping off as usual. Stuff didn't used to be anywhere this crazy 10 years ago. It seems at some point Steam reached some critical mass of users that's let it go of the rails with game sales. Back in 2013 it was generally unheard of for a multiplatform game to sell more on Steam than 360 or PS3, these days even Capcom has switched to PC as it's main platform thanks to the sheer numbers Steam is doing now.
I don't think PS5 will ever be able to catch up in terms of users. Steam is already at around 130mil monthly active users and it only continues to grow, by the time 2028 comes along PS5 should be north of 100mil but where will Steam be then?