I don't know of any legal way to guarantee that a company won't be acquired, and start exploiting it's user base, but I think there are some signs you can look for to see if it's the kind of company that you want to patronize. In the case of Moves, it wasn't open source and didn't offer end-to-end encryption. Privacy and consideration for its users was never in its DNA.

If Zood offers Moves-like location history in the future, it will also provide a method for exporting the location data to CSV or similar (data portability).