When I volunteered for a cat rescue org that was permitted to use the adoption centre space inside a big box pet store, the people in charge were frequently trying to fit 20-30 cats (generally including a couple of litters of 5-6 kittens) into a space with 8-10 enclosed sleeping quarters. With that many cats in one space, some cats will catch and spread colds. It’s a result of the lack of fosters to handle kitten litters.
https://nowtoronto.com/news/toronto-cat-cafe-to-shut-down-amid-claims-of-mistreating-the-animals/