Based on my 5 seconds of Googling, games made about $190b in revenue, 55% from mobile. Movies made $32b, so even ignoring mobile, games are about double what movies do. Games also have massive projects like Call of Duty that now cost $700 million to develop.
Steam as a platform accounts for about $5bn. A good chunk of it is Roblox, Minecraft and Fortnite. Then a handful of really big hitters like GTA and CoD. Excluding those enormous titles, the games industry is smaller than the numbers suggest.
Which is to say, the big fish are the ones with the most influence and least likely to be affected by this.