We are a fully dedicated team to the implementation of Kanboard (I mean that we have budget for this). But the tool is free for our users (we can say that Kanboard created “work” ^^).
(During COVID lockdown, we were gaining more than 1,500 users per month, before we were at ~500).
We are 4-5 administrators and we developed some plugins to facilitate our daily work. For example we implemented the SSO with our LDAP/IDP in order to automatise account creation and login.
Each new user is registered as “platform-manager” and not as “platform-user”, it allows our users to create their own projects and manage members inside (by permissions).
We are using the https://github.com/Confexion/Greenwing theme in order to make Kanboard prettier (because we had some bad feedbacks about UX) with custom adaptations.
By the past our admin team needed to manage : reset password, account creation, login issues etc. Since the SSO, the support is now only about questions on functionalities (and we are redirecting 90% of time to the kanboard documentation) or about new functionalities (interconnect with enterprise applications, UX, new features). I think we have now only <5 mails per day, before we had >30.
Technically we never had major issue with Kanboard or with our server. And we are trying to participate to open source