> It's hard to provide trust to OpenAI that they won't steal data of enterprise to train next model
Bit of a cynical take. A company like OpenAI stands to lose enormously if anyone catches them doing dodgy shit in violation of their agreements with users. And it's very hard to keep dodgy behaviour secret in any decent sized company where any embittered employee can blow the whistle. VW only just managed it with Dieselgate by keeping the circle of conspirators very small.
If their terms say they won't use your data now or in the future then you can reasonably assume that's the case for your business planning purposes.