It is to me personally, as I use it to find answers to questions I don't know the answer to. At a minimum, I can point them to someone who had a similar problem in case they solved it.
I even went a step further and built a product that would generate FAQs from slack history and made it easy for people to add and categorize knowledge from Slack to provide answers to questions, metric, etc...
I would love to have open source communities use it for free if helped them manage supporting their communities easier.
It's https://landria.io. Would love to know if it would be useful for you.