Private Cloud Compute will open up an Apple solution for the specific issue of "not enough device-local compute, but Apple still wants to retain privacy".Siri - "How does Ms. Gemini do that?" Why can't I do that?" "Mr. Cook, why, why?"
The extent to which it solves the problem (real or perceived) of "Apple models, even running at scale, are not as good as what I want" is unclear.
The extent to which third parties will be willing to use that Apple Infrastructure (especially the cases, like Claude or ChatGPT, that people want to use) is also unclear.