What I would do is search for data where the kid is not biological child of both parents. For all the cases I found I would send automated email to both parents saying that if they don’t pay me I will reveal this info to their child, post it on their facebook and email all their friends. How many couples do you think found out that there was a mixup in the in vitro clinic or simply that there was some cheating and didn’t reveal it to everyone My guess is more than 0.

Or I would email everyone on the list saying that I analysed their data and found that there’s 100% probability they are gay/trans/have a small dick. Out of the 7 million, how many would believe it and pay not to have this revealed?

With 7 million users it’s more about running scams than getting ‘dirt’ on the individuals.