... the dev hasn't posted since August 5th sooooooo.
because you are not on Slack, the dev has posted many times since then, at least till end last week (Aug 20).
If he had respect for his partners and investors on Gambit he would post here and also on twitter and not on a slack channel exclusive!
This only projects that he does not give a crap about this project!
there is no requirement for joining slack, nothing exclusive. Just ask for an invite with your email id and you are there. You are welcome. Its better team management service & can be accessed from mobile/PC with an app.