Their cut becomes 25% above a million dollar in revenues and 20% above 50 millions, so it's less than 14% for anything even remotely successful.
And they offer free keys for sale on 3rd party storefronts, free alternative payment methods like Steam cards or in some regions popular pay by cash (person actually goes out to collect) and constant evolution and upgrading of their services on the front and the back end (so funny when a random no name dev says omg you can't do this or that on Steam, they take 30% for nothing and turns out you can, learn to use the best and easiest tools you made the choice to have you bozo) yada yada, haters don't wanna learn in any of these threads so it's all futile to repeat but I guess it has to be said.
This case will obviously be lost since it's so easy to prove anyone can set their own price on Steam and any other store as different as they wish, only Steam keys have (super lax and hardly enforced, just there to avoid abuse) price & sale parity clauses given you still use all Steam services for 0% cut...
Going class action just means it will be further prolonged I guess, with Tim and co funding efforts to perpetuate the slander and lies. Maybe some small court will grant a tiny win here and there by some clueless judges failing to understand what they're ruling but the core of it will be thrown out