Because, if you want to attract founders, it's not a great proposition to state "as soon as you found a company here, leaving the country will subject you to massive bureaucratic pain with significant costs".
Many founders I've talked to opted to leave Germany before founding their companies; and many would-be founders opted to not found their company while remaining in Germany (for now).
Many founders I've talked to opted to leave Germany before founding their companies; and many would-be founders opted to not found their company while remaining in Germany (for now).