if there were an anti-trust court case, maybe a court would decide that Google is required to allow, say, a restaurant review site, to use Google Cloud on an equal footing with Google's own restaurant review service.
it reminds me of the decision where ATT was ultimately required to allow user-owned telephones to connect to its wired network. (in earlier times, ATT only let phones leased from and owned by ATT to connect to its network)