[geekbird]

Pro: Forums can have much more granular moderation than public places like reddit or discord. The making of a new login and having it accepted keeps a lot of the crap out.

Con: PHPBB is a pain in the butt, but is one of the most popular forum softwares. It needs regular and constant maintenance and upgrades, and if it's a busy forum can be nearly a full time job to moderate and maintain.

Slack has message sunset in free instances. Discord is hard to search and has a cruddy UI. Reddit is... Reddit, and it's moderation varies wildly. Twitter is like standing in front of a firehose, trying to drink just what you need.