It is a high-profile case. Careers will be made and destroyed on the back of it. The legal team want to get their ducks in a row, because it involves government agencies and wealthy investors who will be asked a lot of inconvenient questions about their role (like "why didn't you act sooner?", "why did you invest in that company?") I think it's a mix of prudence, an overloaded justice system, and the pandemic that slow this down.