Most people (period) will be unable to effectively hire/build/retain a team who can competently build those associated pieces, let alone all of them necessary to operate effectively at this scale. It is why tech is hard, and remains hard, for the majority of companies, governments, etc.

If something is a core part of the business, 1) it’s something they either already have a demonstrated level of competency in, or they wouldn’t be in business, and 2) efficiencies and improvements here should make them more money in a direct and measurable way, and 3) attempting to outsource it exposes them significantly to counterparty risk that can put them out of business, which is generally not considered a good thing.

In some ways it’s like a factory that uses a lot of power. Should they build their own power plant or use the utility. That depends on many factors. Using the utility is often the better choice and works out better, but not always.

If the quality and price of the power is a core part of what makes the company competitive, probably - and that is going to be a key factor in where the factory is located, when it operates, etc.