It really depends on how you as an entity who is supplying data to analytics firm have negotiated your contract with the analytics firm. Just saying an acquisition will completely negate all contracts before is incorrect.

Also, these agreements are between 2 companies (the company providing the data and the analytics firm which will show analytics on that data). There is no privacy policy per se in this case. It is all about contract negotiation on the rights you give to the analytics firm on how to share the data and what happens if they get acquired.