Sabine Hossenfelder these days is a YouTube personality, who likes to discuss subjects she's not an expert in. I don't know if that's the metric for "crank", but anything I hear from her is taken with a massive grain of salt.
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Feel free to come up with your own predictive model of whether someone is worth listening to. It's hard to compare such models fairly, but if you feel yours is better, it might be worth sharing.