I agree, the karma count was not something that I wanted to see either.
Here is a link to the post from the Dev about being a tester and early access for the Boost app. It contains a link to sign up for it.
Also, these new communities that I have joined since using the Boost app are not showing the instance name in my list of communities.
As the title says, when I join a new community using the Boost app, and then later try to go to that community, I'm getting an error message "404 couldn't find community". Any community that I had already joined before using Boost, I'm not having this issue.
Edit: I did find a workaround for this problem. If you click on the three dots at the top of the community list, then click on Refresh. This seems to fix the problem.
The Dev said in another comment that he expected to release it by the end of August.
