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OK, I've figured it out. It's a security annoyance made by Slack... The links have to be renewed after ever 400 people (currently). I guess that the obvious step is that someone should create a new link and update the website (here's an example PR I just created). How to update the link: Anyone can currently create an invite link via: Apache Druid -> Invite people to Apache Druid However, the link has to be limited by either time and/or amount of people. Before pressing Copy invite link, first click on Edit link settings, where you can set the link expiry to "Never expire". Then click the "Copy invite link" and use it to update the website.

thank you. I just merged the PR.