In case it wasn't clear - a jury awarded Sonos $32.5 million, but the judge just threw that out. Sonos gets nothing.
It's quite possible that both sides spent far more than $32.5 million on lawyers, but it made sense to fight.
Sonos, because they wanted to sue others and not just Google.
Google, because they didn't want to set a precedent that they'd give in when they hadn't actually infringed on anything.