How does the site TruePeopleSearch have all my information on it, from family members to my phone number?

On top of that, once opted out is my data actually deleted or is it still stored? I read that they store IP’s from people who opt out and also may keep emails, so I made sure my private relay was on (new iOS feature) and also used the feature “hide my email” which Apple uses to create a fake email and forward the real one to me. Are those safe enough measures or did I just screw my self …

family information phone phone number privacy