This is an EU fine, but Qualcomm is a worldwide company. So, they could face legal issues from other countries over the same issue. Further, it's not like they only made money from this. So, the calculus in Qualcomm's case is extra profit > fine not total profit > fine.

Also, you're quoting revenue it's profit that's important.

PS: If the US choses not to take their own piece of Qualcomm's illegal profit's IMO that's on them.