A few years ago, I wondered why that was and googled it. I came to an Advil site with an expandable FAQ, and one of the questions was “why does Advil taste sweet?”
So I expanded it out to reveal this shocking answer (or something similar): “Advil tastes sweet because it is lightly coated in sugar.”
Thanks, I guess. I just closed the tab in mild irritation and moved on with my day.