[apocalyptic0n3]

In the past, such forced breakups included restrictions on how the new entities could do for a period of time. As an example, AT&T was not allowed to use any of the Bell trademarks despite still owning them. In theory, the government could bar them from any contact whatsoever once the breakup is complete.

That said, AT&T/Bell was broken up in 1984. The "Baby Bells" had all merged back together into 3 different companies (AT&T, Verizon, Lumen) by 2000. So there would need to be better protections in any potential breakup of Google or any other company today