There was a screening process and many suggest it was run by an 'organisation' that has many streams of revenue in the area. You couldn't just turn up and sing. I did hear that if you got a slot and sang about peace on love you got put next to a very loud act belting out patritriotic tunes which encouraged a certain type of performance style in the street.
They should go over to the Wet Kowloon Cultural District. I bet they'd chuck them out of there too.!
In the last 3 years someone from the government said they have successfully prosecuted around 25 street performers and people with loud hailers for causing a nuisance. I believe none from EPD evidence or on Sai Yeung Choi street.
It seems they are enforcing the law in Times Square. Interesting