Re:Ask HN: Why some slack communities use url *.slack.heroku...
by azebazenestor on Thursday January 12, 2023 @12:12PM
(#34356953)
Oh.Thanks for answer.
So the heroku app was created when it was not possible to sign up without being invited.
I think some communities want a custom invite page explaining what the community is about. The official signin/signup page lacks any customization options.
(Both Heroku and Slack are owned by SalesForce these days. The Element project pre-dates those acquisitions)