This interview is pretty old by now but gives some hints as to the situation and is worth a read:
https://www.highfidelity.pl/@main-924&lang=en
Keep in mind this is A) from before Mytek and their partners HEM (who now make Ferrum Audio gear) split up, and B) only one sided, with the HEM folks giving their perspective and nothing from Michal of Mytek.
Even so, you can hear some frustration already. Who would talk about their partners like that in an open forum? They are basically badmouthing or minimizing the contributions Michal made to the project over the years. I would say by the time this interview took place in 2019, things were probably already going south quickly. You can read between the lines.
I am not even a huge Mytek fan but I take Michal's side on this situation. Seems like he was wronged by the HEM people. Michal appears to be continuing with Mytek and focusing on the higher end (Empire line, including the new GANFET monoblocks at $10k each), also doing side projects like designing the MoFi StudioDAC.