In my case, I actually persevered with my parents for years after I moved out, despite them being completely hopeless, neglectful parents for most of my childhood. My Father's ineptitude was down to his addiction issues, but aside from that he was a decent enough person, especially after he became teetotal. My Mother on the other hand is narcissistic, thoughtless, cold, vindictive, uncaring, mean, completely lacking in any self-awareness, and totally oblivious to her own callous and hurtful behaviours.
I kept in touch with irregular phone calls etc, more out of civility to my father than anything else, but in the 30 years after I left 'home' my mother never once lifted the phone, never once visited or attempted to arrange a visit, so it was always quite clear to me that no matter how she might describe our lack of a relationship to other people, she simply didn't care enough to make any effort.
My father passed away a few years ago, and since then my mother's behaviours have just confirmed for me that everything I always thought about her is true. Throughout Covid I did my level best to stay in touch with her, offered to go and physically support her on several occasions, all of which were rebuffed or met with no response at all, and then afterwards she had the nerve to tell me that I 'clearly didn't give a shit' because we'd been having a short convo over a messaging app and I had not started it by enquiring after her health.
So if a woman who paid no attention whatsoever to her own child, and made no effort whatsoever to get in touch over a 30 year period can turn around and claim that the child 'doesn't give a shit'...
It wasn't the neglectful parenting that did it for me, as I said, I made an effort, it's the fact that my mother still carries on in the exact same way that has led me to realise that there's no point in bothering to be civil. I get nothing in return, and my life is happier and less of a pain without her in it at all, so I am absolutely no contact with her now and would rebuff any attempt whatsoever from her to make contact.
I'm totally onboard with 'kids owe their parents nothing'. People don't get to choose their parents or family, so the idea that they owe a debt to them purely because they are related by birth is a nonsense. If my mother had behaved in a normal human manner I the years since I moved out, I suspect we probably could have buried the hatchet and formed some sort of relationship as adults, but quite simply, she's not the sort of person I'd spend any time around if we weren't related, and in fact, she's so abrasive that she was any other person I'd met in other circumstances I'd have known after five minutes I never wanted to meet her again if it could be helped.