The cat would have a terribly boring life.
https://daily.jstor.org/environmental-danger-outdoor-cats/
There’s the academic source, and for my anecdotal one my family’s yard in Connecticut is much quieter on a June afternoon today than it was 20 years ago.
There are responsible ways to keep indoor cats entertained. If someone can’t do that, then it seems to me they’re just as unsuited to having a pet as if they couldn’t keep it fed.
I doubt any of the cats I've ever had would approve of this
It just takes some time to train them usually. It's much easier if you get them used to it early in their lifetime, though.