It can be done, but it involves at minimum, monthly trips to the vet to make sure your cat is healthy, and if they’re not healthy, you don’t know until they are VERY unhealthy without the regular tests. So in general it is not a good idea. Keep a pet that naturally thrives on a vegan diet. Or wait till lab grown meat cat food is available if you really must have a tiny murder machine as a vegan.
Yeah, many plant based alternatives are cheaper than meat to produce, but it has become a thing that vegan alternatives are expensive so everyone raises the price to match.
I forgot the company but around 2015 there was one brand talking up about because of how cheap it was to make it would be a great thing to help with hunger levels in impoverished areas. Just really talking up how they were going to be cheaper than meat. Year later, priced up to match the rest of the brands.