No 2FA, no muting/blocking or following, non-transparent moderation using long-discredited techniques, security through obscurity. For a site devoted to discussing the latest tech, the site itself is curiously stuck in the 90s and the grognards like it that way.
At least it has kept the nice 90s atmosphere too. Generally HN users are high value targets - how little spam or trolling there is to be found here by outsiders is incredible considering the lack of safeguards you mentioned.