With enough layers you will also weed out almost all of the good actors. Normal people are busy and don't have time nor patience to jump over too many hoops to promote their cool new research, or to respond in a thread where someone linked it.
The main subreddits will basically shadowban you until your account is aged and has more than X karma.
There are a lot of flaws, though. Their appeal system is very broken, for instance.
Reddit hasn't been as overrun by bots yet, for the most part, although how long they can hold out I don't know.
We live with GenAI, and the human to bot ratio is now leaning in a different direction. The old norms are dead, because the old structures that held them up are gone.
This idea that theres “more hoops - losing participation” on this thread keeps assuming that the community is unaffected by the macro trends.
It’s weirdly positing that HN posts and users, are somehow immune/unaffected by those trends.