Is the paparazzi's behavior legal

The behavior of paparazzi (paparazzi refers to stars, whose behavior is as legal as that set up by the Hong Kong police) is illegal for ordinary citizens, but it is debatable for stars and strictly illegal. But according to paparazzi, stars are public figures and should be paid attention to (some stars deliberately create momentum). What's more, breaking the law for money? The contradiction between stars and paparazzi is very common, but look at paparazzi. So stars and paparazzi depend on each other and get what they want.