Apple One - Payment for privacy

Dear Forum,

im enjoying Apple One, except for the privacy. As head of the household I’m happy to pay. Recently, A family member purchased an app that was personal to them. The cost is not the issue, or the payment method, but every family member should have the ability to have some secrets. The app in question dealt with mental well being.

Here’s a hypothetical. My son downloads Grindr (a gay dating app) and subscribes, on my credit card, but he is not openly gay. How as part of the family payment system can he hide this from me/pay for it himself. Everyone is entitled to their privacy, and I’m concerned that the Apple One payment system is too intrusive.

it’s probable that I’ve missed something and look forward to being educated by the forum, thank you in advance.