On top of that, if you can be shown to benefit from the crime (e.g. by knowingly taking payment for providing services to those that commit it), that presumably makes you more than just a bystander in most jurisdictions anyway.
It is only for specific crimes not all crimes and there are exemptions when you don’t have to report the crime in Germany. For example family members don’t have to report if they try to convince the other party not to do it. Priests and other religious figures don’t have to do it. Lawyers, physicians, therapists etc. are also exempted.
It is also only for upcoming not yet accomplished crimes. Crimes already happened don’t have to be reported.
Also it has to be proven that you received the plan in a plausibel manner.
That link you posted is 1) about very specific crimes (treason, murder, manslaughter, genocide etc.) and 2) it applies only when you hear about a crime that is being planned but which has not been committed yet (and can still be prevented).
That heavily depends on the jurisdiction. It's explicitly a crime in Germany, for example: https://www.gesetze-im-internet.de/stgb/__138.html
On top of that, if you can be shown to benefit from the crime (e.g. by knowingly taking payment for providing services to those that commit it), that presumably makes you more than just a bystander in most jurisdictions anyway.