A lot of Google's features when integrated and leading to ads and other Google properties they are justified, but if you were to forbid cooperation between the divisions, they may be shut down or diminished, as on their own they would need to be subsidized considerably and the 3rd party alternatives for ads would take most of the profits probably leading to negative cash flow without decreasing the level of service or charging fees.
What if they are valuable, but only when integrated with other parts of the company? At many of these companies, I can think of several products in big tech that are good for consumers and profitable but can't be done in a different, independent company.
