In antitrust fines are generally not capped, since the whole point is to make giant companies pay attention. The EU fined Google 2.4B euros in 2017, then 4.3B again the following year. Even for Google, 7 billion USD isn’t play money.

A market block wouldn’t have to be all or nothing. Maybe start with the offending products: Activision games, Microsoft’s cloud gaming service, etc.