Overall pretty exaggerated. N26 is against a worker's council, but they are not preventing the employees to form one, and will accept their decision.
There are some Betriebsrat trainings where this kind of issues gets talked about, and what are the legal means to counter-attack them.
That would be a crime in Germany, you can go to prison for and they are actually very very close to crossing that line, if they haven't already overstepped it.