The amount of money Valve rakes in with Steam is insane. If itch had even 0.1% of that it would be much bigger. Itch had to limit dynamic filtering (like searching for Arcade + Fantasy) to just a few preset tags because of the server load. I wouldn’t be surprised if the number compared to Steam is less than 0.01%. People who want DRM free games generally go to GOG, hell a lot of DRM free indie/AAA/retro games don’t even get listed on itch, so they get only the tiniest portion of the pie.