In fact, pigeons have no effect on them; they just coo. Finally, I put a net on my balcony.
At the moment I have peace from the pigeons. What is not ideal, however, is the hook. If there's a strong gust of wind, the crow is gone. I have created my own system.
The day after I put this crow in the flowerpot, a pair of pigeons wanted to build a nest next to it (in the same pot!!). Save your money.