With the Reddit blackout, I see plenty of communities redirecting their members to their Discord.
But Discord is far from being a real knowledge base, it's overwhelming and information is not searchable through a search engine.
Why not use a forum-like solution like Discourse?
This means that forums are always under attack on multiple fronts and require time consuming moderation and maintenance around the clock.
Centralized solutions like Discord and Reddit can use economies of scale to tackle the problem in a much more cost-effective way.