Reading between the lines I think a key part of what makes chatbots attractive, re lack of judgment, is they're like talking to a new stranger every session.

In both IRL and online discussions sometimes a stranger is the perfect person to talk to about certain things as they have no history with you. In ideal conditions for this they have no greater context about who you are and what you've done which is a very freeing thing (can also be taken advantage of in bad faith).

Online and now LLMs add an extra freeing element, assuming anonymity: they have no prejudices about your appearance/age/abilities either.

Sometimes it's hard to talk about certain things when one feels that judgment is likely from another party. In that sense chatbots are being used as perfect strangers.