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It sounds like a moral statement because it is a moral statement. Nothing wrong with that IMHO .

It's not an insane idea that octopuses might not enjoy being stuffed into what amounts to a studio apartment for their entire life.

They are also notorious for finding increasingly cleverer ways of escaping aquariums. Which again adds to the case that an aquarium is not a suitable environment.

IDK, their main aquarium is the entire ocean, and they still come up on land.

Same with dogs and cats. It's just slavery.

>It sounds a bit presumptive of a universal morality rather than a logical statement.

Logical statements just by themselves are for Logicians and/or theorem provers.

But they're also useless by themselves (just an axiomatic rule sustitution game).

To have any value in human life they are combined with utility functions, morality, and other such things.

For my purposes, because their short lifespan and particular needs make them pretty bad pets IMO. Never mind the moral arguments for keeping such intelligent animals in captivity.

Octopuses are known to not live very long in captivity.

Though they also don’t live long in the wild either. Fascinating creatures.