Just wait it out, Google will either build something like it or buy Shortwave.
Edit: Oh, OpenAI is partially owned by Microsoft so unlikely at this point. The real tech here is OpenAI APIs. Swapping it out on the backend with something else could drastically change it's usefulness.
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Is there something like this that does not require you to give them all your data for free?
Just wait it out, Google will either build something like it or buy Shortwave.
Edit: Oh, OpenAI is partially owned by Microsoft so unlikely at this point. The real tech here is OpenAI APIs. Swapping it out on the backend with something else could drastically change it's usefulness.
Yes, I'm sure Google will eventually have the same thing, and you've already given THEM all your data for free.