It's the wrong question. If an unlicensed therapist verifiably encourages someone to kill themselves...we don't entertain the counterfactual and wonder if the person was bound to do it anyway.

Instead, we put the unlicensed therapist in jail.

What about a friend trying to support someone in dark times?

I'd call the cops on them* at some point to stop them from harming themselves and I'd never say what ChatGPT said here, but I'd still talk to them trying to help, even without being a therapist. I can recommend a therapist, but it's hard to reach people in that state. You got to make use of the trust they gave you.

* non US country