My university - University of Applied Sciences Darmstadt - is now also using Collaboard as a DSGVO-compliant online whiteboard. Integrating it into Moodle is a bit cumbersome/not User friendly: create a whiteboard in Collaboard, set the sharing options via a password, create the board in Moodle through the URL activity, and provide a description informing learners what they can do with the board and what rights they have.
In our ideal scenario, instructors use Moodle as the central access point and create a Collaboard activity here. After entering the name and description, they select in the further settings whether learners have read-only or also write permissions for the board. Once created, the board is directly usable.
I recently contacted Collaboard, and they could now provide a developer: He has already implemented a similar scenario for NextCloud as a plugin and might also attend the Moot or be available via Zoom.
Do you use Collaboard, and would you be interested in participating in the plugin development? I am a UX designer myself and would definitely need developers.