I think that depends heavily.

Yes if the live chat window is annoying you that you should buy something or sign up for a newsletter that is super annoying.

But if you really need help and there is a human within one second on the other hand this is amazing.

Also vice versa. If I'm online on Crisp or Intercom it is super easy to understand what my customer tries to do and help them within a second.

Not everything is negative about live chats, as always :D