Does Meiro have an opt-in/ opt-out process? Can a user decide if data is tracked?

Yes, we do specify in our contracts that the owner of the website or mobile application where Meiro Events works, manages and is responsible for the opt-in, opt-out and all other management (including coverage in the privacy policy) of our Meiro Events SDK. 

Clients add the Meiro Events SDK into their own privacy policies and manage if it runs or not for users.

Our recommendation would be to disable Meiro Events SDK if there is no consent from the website visitor, but decision and reponsibility lies on the owner of the website to decide.