According to this Bloomberg article, it’s alive and well in Switzerland:

Switzerland entered a treaty with the European Union to import workers, seeking more bankers, managers and academics.
What it got was an influx of prostitutes.
The number of people offering sex for money has risen by a third in Zurich and 80 percent in Geneva since Switzerland opened its borders to workers from the 15 EU-member states at the start of 2004, police estimate. Some lawmakers predict prostitution will grow even more after the government last year removed work restrictions for residents from 10 newer EU countries as well.