https://news.ycombinator.com is one example :)
This thread disagrees with you. HN is slowly becoming like Reddit. Down-vote all you like, it doesn't change the facts.
Re:Why do I care the open web is dying?
by TheRealDunkirk on Tuesday December 01, 2020 @01:24PM
(#25268060)
Given that Reddit is, at this point, nothing but a thin, MOSTLY-public-friendly landing page, papering over the world's largest porn portal, it's unsurprising that people who value original thought have left and found other places to discuss things of interest. And when THOSE people leave, the people who like to troll THEM have to find other places to do it, too. Slashdot has also suffered from this diaspora.
Re:Why do I care the open web is dying?
by coward8675309 on Tuesday December 01, 2020 @10:32AM
(#25266008)
What, so that thousands of HN readers in search of an authentic open web experience can trample them into dust?
Re:Why do I care the open web is dying?
by DoreenMichele on Tuesday December 01, 2020 @05:57AM
(#25264171)
Tagfam.org might qualify, though it's a niche subject. Oldest education related forum around, afaik. Though it's a set of email lists, not boards.
Re:Why do I care the open web is dying?
by grey_earthling on Tuesday December 01, 2020 @08:47AM
(#25265055)
https://neocities.org/ is another prominent example.
Would you mind sharing some of the links, please?