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Adchoice unfortunately is a legitimate ad company and may not be able to be completely removed. Try the below anyway:
Other then that the only sure-fire way I know of to remove it completely is to root the phone (voids warranty) and install an ad blocker
You could disable the notifications for those 2 apps if you don't want them
instuctions on this page: https://www.androidauthority.com/samsung-galaxy-s8-how-to-disable-notifications-769234/