To enroll, you must answer the email and send information to the lawyers. It's not just that they can get you involved without your consent. If they do that, those lawyers would be breaking the law and could be sued.

The lawsuit has nothing to do with Steam's percentage, and that's not going to change. It's very, very unlikely to be successful or that the people who participate will receive any money.

The lawsuit is based on a rule Steam had, whereby to publish on Steam, you had to agree to the conditions of not selling your games for less on other stores. For example, if you sold your game for $10 on Steam, then you couldn't sell it for $8 on Itch (assuming you would pass on the percentage difference each store takes to the players).

The lawsuit alleges that this is against the law and that it supposedly harms sellers, customers, and all the other nonsense lawyers tend to use.

Personally, why do I think the lawsuit won't be successful? Basically, because the plaintiffs must prove harm as a result of these policies, and that's very difficult to achieve.

If you sell at 10 on Itch, which keeps 10%, then that 20% goes to the developer; you don't lose, you actually win.

If you really want to pass the price on to players, you lower the price based on the percentage of users per platform.

As far as I understand, Steam has never lowered any game due to this policy.

For all these reasons, it's very difficult for them to prove real harm, but who knows.

If the lawsuit is successful now, it's most likely that the people who bought it (not the distributors) will be the ones who receive the money.