“The updates to App Store Review Guideline 5.1.1 last June provided users with greater control over their personal data, stating that all apps that allow for account creation must also allow users to initiate deletion of their account from within the app.”
If an app lets you sign up in two taps, it now has to let you leave in the app too. No more emailing support or hunting for a web form buried three menus deep. Apple is doing what regulators should have done. It is also doing it to the companies that sell ads against your data, which is not a coincidence.