The art as well as the animation are both free.. you can run the scripts for free off your computer.. and if using paid resources it's not that expensive.. you can generate a good 20-30 animations for around $30 with each animation being around 5 second loops. This is not complicated.
So again, its entirely free to do AI animations as well as the artwork on your computer.. it takes a small bit of time to generate a slew of animations and fine tune them again through the AI. Resources like Comfy make it quite simplistic especially for small loops where you only need 2-5 seconds of motion for each scene..