I can't blame any company for wanting to stay out of that market.
[A] probably? I couldn’t conclusively determine this, and I’m not an expert
Long story short, for being a publicly traded company, they would need to "transform" to an AG ("Aktiengesellschaft", where "Aktie" means "share of stock").
Its a limited liability structure and most businesses from small to large that have private shareholders use it (Red Bull or Porsche Holding are GmbHs for example)