I consider my HN comments to be contributions to the HN community. I received some benefit in return for those comments, e.g. responses that improve my thinking.
I may retain copyright over those comments, but by posting them on a public forum I've given that forum licence to publish them.
This is the full license you give for posting to HN:
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Irregardless of your license the site need to comply with local regulations. In gdpr especially consent might be retracted at any time regardless of whether the consent was given or not at the time.
I consider my HN comments to be contributions to the HN community. I received some benefit in return for those comments, e.g. responses that improve my thinking.
I may retain copyright over those comments, but by posting them on a public forum I've given that forum licence to publish them.