From what the link says it doesn't seem that hard if your cat happens to like some brand of vegan cat food you can get, since those seem to be generally nutritionally ok (also going off the study the other comment replying to me linked). I would hope that most people that can't find a brand of vegan cat food their cat likes would just decide to not bother, or actually put in the full effort.

At that point the main scary thing is that if you only feed your cat one brand of food their entire life, they can sometimes get so used to it they refuse to eat anything else. But plenty of people run into that without going vegan, so eh. Overall it doesn't seem to be an issue provided you're not an idiot about it, which in this case I would actually guess most people aren't.

Yeah that study is pretty convincing, especially along with the other commenter providing a link claiming that the parts of a cats diet that usually require meat can be quite easily synthesized from vegan sources. That's good to know. (Minor caveat of the study would be considering cats that go outdoors as being on a vegan diet when they almost certainly eat wild animals, but it doesn't seem results were inconsistent between cats that go outside vs. cats that don't, or maybe the full study even mentions it).

Also fwiw I wouldn't trust the first link on its own bc what companies claim and what they actually do doesn't always line up, but when there's multiple studies backing it it has much more credibility.

But yea you've convinced me