Google has lost its final legal challenge against a European Union penalty for giving its own shopping recommendations an illegal advantage over rivals in search results, ending a long-running antitrust case that came with a whopping fine
They could force ISPs to block, not allow physical hardware sales in stores, take over any assets (offices), confiscate their server farms. There's lots that can be done.
They lose their business license. Shut down the retail locations. Customs will seize all imports of their goods into the country. They can do a lot to make it so trying to circumvent the system just isn’t worth the hassle. Their income from that country will plummet regardless.