Many Dutch cities take active measures against drug tourists. They are not a profitable or desirable crowd. Besides, most drug tourism is and always has been from countries where drugs laws are still (relatively) strict.
It was so bad that the mayor of Amsterdam noped out of introducing it, together with most mayors in towns that doesn't kiss a border. I believe most, if not all coffee shops in the Randstad area (Amsterdam, The Hague, Rotterdam, Utrecht) are still welcoming any adults into their coffee shops.