Unhappily for the fish, much of the problem lies with the breeding...sibling breeding, crossbreeding, overbreeding...if a breeder gets a colourway that they like and they know will garner more money, they will exploit it. In doing so they will breed from that fish to get similar colourway that is close to the original, even if that means using that parent fish many many times with its siblings to get it
The breeder gets the fish he wants and a very healthy bank account....the fish has a significantly weakened immune system, shorter than average lifespan and gets illness/disease/deformities more than other Betta that have been bred properly.
The breeders who produce the most exotic colourways either through overbreeding, genetic manipulation or injection do not care about the fish, they care only about how much they can sell them for cos they know that there is a guaranteed marketplace for them