A controller is not responsible for ensuring that pilots observe their aerodrome minima, and is not to query the right of a pilot to attempt a landing or take off.
And thats quite okay so in my book. Its the authorities job to check these things.
When getting a SAFA check they usually get a hard on when they see the plastic bag of a life vest slightly torn or the like. They should mind other things.
BTW, as of german law, flying privately the approach ban is not in force, it still is look and see. Having flown 17 years solely commercial IFR, I find it surprising these days how often I can actually see the runway in conditions IŽd commercially not dare to try. (eg. 450m RVR reported, got the lights at minimum plus 50 ft, which is way above 550m)