Basically, back office work offshoring like in the 2000s is dead. Now entire revenue generating or complex IP product lines are being produced by offshore teams.
GCP's Security and K8s portfolio is a good example of that or that team at Facebook's Infra Silicon team in Bangalore.
The first two hits I get are for Gnu GCC and the Accenture article explaining what a GCC is.
The AI Summary box at the top of the page does have Global Capability Center, but it's far enough down that you have to expand the summary box to see that meaning.