Comment by Bender

The legal landscape has also changed.

It did change a lot but the biggest changes were the ToS/AuP of server/VM providers. What was not even taboo in the early 00's was becoming a problem keeping an account active on clear-web sites. Across the board many providers starting using the vague word "lewd" a word I had never heard of even after running porn sites for a long time.

Many of us moved to .onion despite being incredibly slow at the time. We would keep an unpublished clear-web sub-domain active for the old time users so they had a fast connection. Eventually that was even problematic so many forum operators stopped accepting new users and made their forums private or semi-private. Some still exist and some got married, had kids and real life took too much time and energy to also run such sites.