EVs (and their resulting large battery packs) haven't been available at scale long enough, but there are already established businesses for recycling standard car batteries and it's why you pay a separate "core" deposit in the US to ensure they go back into the system.

People are starting these businesses already, it's yet another logistics problem to solve. Right now there is more money in pulling apart the packs the using the cells as salvage than there is recycling, but as more and more EVs reach end of life you can bet it will be a sizable market.