Sure, if they’re abandoned.
The issue is that we have so, so many stray cats. So, so many cats left in shelters. We do not need people to breed more cats just so people can have their very expensive and very specifically bred designer furbaby. We need people to take care of the ones that already exist and are already struggling.
At this point people can believe in whatever they want as long as it doesn’t harm anyone else. Someone believing in a bunch of crystals and burning their money on them is a lot less harmful than other beliefs that I won’t mention.