I'm not sure if commenting on this thread will help since I recently discovered I'm affected by this when a kind stranger replied to one of my recent comments saying they had to "vouch" for me, so you might not see my comment anyways

I think in my account got flagged because of three things

1. Age, it's a pretty recent account, I used to have another one that's like 8yo by now (if not more) but I lost access to that email (and I could've benefited from a username change, so I decided to create a new one)

2. I created this account using a VPN, I have a slight suspicion that it caused me to be soft-banned from the start, but I can't confirm

3. HN probably implemented more strict filtering due to the advance of LLMs

If I were to pinpoint on a exact cause I'd say it's more likely that 2 and 3 are contributing much more than 1