Nice chatting today @andras.hartmann!
After our talk I recall that the site I pointed you toward has also done a review of KolabTree which might be interesting to you or others
IGDORE affiliate and Ronin Scholar @zoya.marinova has also been interviewed about her work on th platform:
(as a personal note, I used KolabTree for a while after first leaving academia and had mixed experiences which I described briefly here)