Thank you for the extensive answer, @it33. There is no doubt we can contribute in both effort as well as some funds where applicable.
By now, I understand that the Mattermost focus is a bit different than ours, as we focus on closed groups in one value-chain : associations and its members, universities and its students or companies and their distributors.
When we take the plunge it is costly to change later, hence the emotions and energy. Basically we need confidence that we can achieve our goals one way or the other, but are unsure if we can...
+1 for the pleasant atmosphere here 