"Except they had to invent some sort of control collar to get them to do what they want. Those probably weren't free. And they take time to grow. And it's just a dumb idea to begin with.

Also, I notice you dodged the most important question: why did the creators of this race of ships allow it to continue?"

Never bothered to watch Farscape, but ...... the idea of enslaving living ships seems to kind of ... defeat the purpose? I know I wouldn't trust walking around inside the body of an unwilling slave ....

The space whale from Doctor Who: The Beast Below was trying to help, and was enslaved and abused instead (it was the entire upshot of the episode. Way to go, black queen!) Not really a living ship, I guess, but it was forced to act as an engine. The only reason it didn't rebel against its lot was because it was kind.

The Lexx seemed to just ... accept what it was in the same way one accepts being what they're born as a matter of course. It wants its food, orders and pilot, and it's a happy individual. It's not stupid, just simple. Kind of like a big dog that'll take you anywhere in the multiverse and can wreck planets, but looks like a bug. One of the scarier concepts in sci-fi.

The ones in No Man's Sky seem similar to the Lexx, with an even bigger "touch of alien" about them.

And I don't think people stop to think of what a "living ship" means beyond "potential slave for human use" - it's a species that doesn't need weak-ass monkey tech to get to Earth.