I’ve had two pet cats as an adult. The first one was very chill, probably because she grew up as a stray and appreciated being inside and cared for. The second one we got as a kitten, and she’ll bite not only when she’s upset about being grabbed, but also to show affection. Luckily, she hasn’t figured out that biting hard is a thing yet, so she just kind of gnaws on you without breaking the skin. She hasn’t yet figured out that she can intentionally try to claw people in anger/defense either, so the only times she ever actually does damage is when she climbs on you and uses her claws to hold on.