Why does industry fail to gain trust with customers whose data they use?

I think probably the reason they haven’t is companies may be concerned that by telling you why or how they are targeting then their advertisers may see that as a commercial secret, you know I’m targeting people between 25 and 29 and they are men and they are doing this and this, and they might be trying to hide that but I don’t think that’s the way to go forward in the long term.