We would not be Germans if there was no administration and some fee to be payed
For fun I just looked up my last bill from 2012-2014 (they always wait until several years have summed up).
For the actual frequency use the fee was 23,33 €. For the efforts regarding electromagnetic compatibility it was 65,24 €. So 88,57 € for three years or 29,52 € per year.
You do not have to actively validate, but if you do not pay the bills they can revoke your license.
Of course amateur radio exams and issuing of call signs costs extra in the range of 70 to 150 €.
This is all done by the Bundesnetzagentur, the telecommunication office. They also do the auctioning of the 5G frequencies, a more profitable business.
@KI7MMZ If fully agree, showing activity is important. But less than 70 000 licensed hams are a minority out of 80 000 000 Germans. So having an influence on politics is hard.
73 de Michael, DB7MM