Cats are monstrous opportunistic predators that eat whatever is easiest to eat when hungry. The amount of effort they'll expend is directly proportional to their food supply and level of hunger. Think bushmasters or sharks, but cats.

If their hunger is reliably sated with foodstuffs that don't run or bite or scratch, they may be less impelled to actively murder something that does one or more of the three.

Wild mountain lions eat house cats like they're going out of style.

Being both a pure predator and potential prey contributes to house cats bipolar personality. Their defensive "Whatwasthatnoiserunforyourlife" reflexes are at eternal odds with their primal "I'm a killa, deal with it" mindset.

But if its a post-scarcity situation where they can see another animal as "friend", they do seem to view them as larger/smaller versions of themselves. Its their own crude concept of "personhood". Pet cats even see their owners as big inscrutable cats. So another type of cat is something they're relatively compatible with, as they share the same mindset and body language.

In this video there's also the sad fact that a caged animal may suffer from crippling loneliness, and even stand-offish animals like cats will eventually become starved for any kind of affection and socialization, and either make an interspecies friend or go mad from isolation.

A depressing tale I heard once was from someone who worked at a research lab, the caged cats were so desperate for any sort of contact that they would all stick their paws out through the bars to try and touch people walking past.