The blatant abuse of so called service dogs is just a way for people to drag their stupid pets everywhere.
I’m very allergic to cats and get pretty upset when some idiot destroys my flight and at least the entire day cause they insist on flying with their stupid cat
Cats don’t need to be official service pets in order to fly in cabins on planes.
And if you are so allergic that a cat somewhere in a carrier on a plane with you for a couple of hours is problematic, I don’t see how you can function out in public generally. (E.g., someone sitting next to you who just had a cat on their lap presumably would be more problematic than a critter at the other end of a plane from you for a couple of hours.)