Since the only users who would likely care about this derive far more value than the $20/month of OpenAI's direct offering. Why doesn't OpenAI market this service, but with chat history, for something like $200/month?
And the reason is, it's enough for OpenAI to "say" that they're "not going to use your data" - you need a cloud deployment where you can control network boundaries to _prove_ that your data isn't going anywhere it isn't supposed to.
Microsoft is an investor in OpenAI, but does not own it, and they are legally separate companies. OpenAI is not Microsoft and it is factually incorrect to claim that OpenAI is Microsoft.
[1] https://blogs.microsoft.com/blog/2023/01/23/microsoftandopen...
It's not just a straight trade of dollars for shares, but many further contractual obligations.
Thus, it could very well be OpenAI has taken dollars, is commercially selling its technology to Microsoft on terms which aren't special, and sama and the OpenAI executive team and board has independently concluded that engaging in the partnership is a stellar way to grow their OpenAI brand, business and valuation?