There is literally nothing you can do to earn my trust with that much data - the rest of tech has not just scorched that Earth, they've glassed it. The only thing you can do that would make me consider becoming a customer is cut off your own ability to spy on me - by ensuring my data stays local and you have no access to it.
Editing to add: I considered Rescue Time in the past, used Freedom for a time (until I realized they were sending off my data and what that meant), then used qbserve for a long time. Stopped while ago when I realized I'd stopped looking at it and had stopped feeling like I needed it.