Germany is one of the worst countries when it comes to bureaucracy nothing is fast here if you go the legal path and stay within the law (which is mostly for small people big players have different ways) and as you see everything costs a lot so if you are founding a pure online business do yourself a favor and incorporate somewhere else and if you still live in Germany look into licensing or subcontracting yourself to your company in another country it's way more flexible and you probably have Easier access to grants etc.
Another part is taxation the tax office takes your money really fast but returns can be another slog where the tax office denies legal claims again and again untill you get a lawyer etc. and it generates costs again needlessly because it's really dependent on who works on your tax records and there mood apparently.