Earlier quoted context omitted.
Worker Councils seem to have broadly similar but slightly different rights and responsibilities in Germany. They are never mandatory, however employees do have the right to form one if there are at least five employees who are eligible to vote (18+) and if at least three of those can be elected (>6 months with the company, broadly speaking no one in an important management role). At least three employees have to take…
It is painting a target, as you said. at least with many employers. also being part of a works council can massively hinder your career, even if officially there are protections in place against such things. but being a works council member myself I can assure you that even the best employers can have very subtle ways. Works council members from different companies talk and some stories are outright scary.
In the company I work for some join the (Dutch) Works Council just to get ahead in their career. They often join until they're promoted. It's a huge international shipping company.