i have never used an AI customer service chat that was more helpful than the previous deterministic chat bots that regurgitate the FAQ or whatever.
ChatGPT was released to the public four years ago and today i can't think of a single software feature or product that uses it that i would miss if it disappeared today.

@peter That's not right. ChatGPT was released in November 2022. Which makes it 3 years and some 4 months old, by my human calculation skills.

Before that, there just wasn't a chat interface, but you could use GPT3.