Why does Truly taste like aspartame even though it’s not listed in the ingredients?

Just bought some to try the other day as I couldn’t find anywhere online, including their website, that there was aspartame. It’s advertised as low sugar but DOES contain a little cane sugar, but says nothing about aspartame or sugar imitators on the label.

So why does it taste like a$$? It 100% must have some sort of aspartame in it because I can taste it a mile away. How do they get away with not listing that on the ingredients? Some people have allergies!

Maybe I’m dumb but if someone can shed light I’m open to being wrong.