TLDR: HN accounts were under attack after Keybase was giving money for free
Recently, Keybase decided to airdrop 2 billion Lumens (XLM) since the Stellar Development Foundation wanted a good way to get a good user base. Although I can't attest to how well that's working (most if not all people I've heard have either donated it to non profits like the Tor Project or have just converted it to USD or BTC), it's caused a problem Keybase may or may not have foreseen, at a larger scale than they probably imagined:
To qualify for this airdrop, you needed a Github, HackerNews, and a Keybase account to be all linked together before September 9th.
So if you were a hacker, the only logical thing to do is start excavating all the old dusty accounts of HackerNews and (presumably Github, although I haven't heard or seen anything regarding them)
Less than a week later Keybase updated their page saying the following:
Daniel (dang) from HN seemed to have seen this attack during or before this announcement, so he made a logical decision to "shadow ban" the "about" sections on HN accounts
My account for example, had the following about section:
But for some odd reason this never showed up in my about section (when going to incognito mode to check it out publicly). After emailing Daniel about this, he described that he pulled the curtain on accounts that had Keybase verifications to prevent from attacks.
In his words, he "tagged" accounts that had this verification, although I'm not sure which accounts were particularly tagged as I see some accounts with a description with their Keybase verification and those who (presumably) have an about section with a Keybase verification and a hidden about section.
When your account is tagged, your "about" section doesn't show up, regardless of what you inserted (which is what happened to my account).
Daniel mentioned this will restriction will be removed soon after the wave of attackers settle down.