It's silly to try to "connect" a suicide to someone using a chatbot for romantic reasons when it could equally be that people who are depressed might use such bots. Also, anecdote.
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It's like saying "someone who is known to speak to therapists committed suicide, this means that therapists make people commit suicide".
It is also interesting how people kind of just let people get away with speculating things out of thin air like this, without any real basis for doing so, even though it is a very serious accusation to make.