I have used AdGuard for years and it works great.
https://apps.apple.com/us/app/adguard-for-safari/id1440147259?mt=12

Yeah its unreliable. Its probably the dog.

Anything is possible. If you notice problems with it afterwards then yes you damaged it.

congratulations?

If the app developer uses their own sound then they will continue to. If they use the default sound then no you cannot change it.
https://9to5mac.com/2023/09/19/ios-17-iphone-app-notification-sound/

nope.

no major problems, it’s fine.

Apple Support answers this here: https://support.apple.com/en-us/HT201302

Tap it, open the app, and find out.

You can sell anything to anyone if they are willing to buy it. (not legal advice)

Correct, iPhone does not show this natively. There is no easy to know at this time. https://discussions.apple.com/thread/254227987

You have to have the organizer of your family change their purchase sharing settings. See below.

Organizers for Family Sharing groups have a choice: either the payment method is set to their Apple iD account - typically a credit card - or the payment method is set so that individual members pay for their own purchases. This is called Purchase Sharing and is described in Apple’s support document How to share purchases with your family.

Which payment method is charged for purchases that family members make?

When Purchase Sharing is turned on, everyone’s purchases bill to the family organizer’s payment method…

If you’re the family organizer and you don’t want to share a payment method with your family, turn off purchase sharing. When purchase sharing is turned off, you can continue to share subscriptions like Apple TV+ and Apple Arcade. When Purchase Sharing is turned off, everyone must use their own payment method.