You can't really hide a satellite dish, seems to me it would be easy to find houses with illegal equipment?
The article says "Satellite TV, however, has become common in even small villages, with as many as 70 percent of Iranian households owning a satellite dish."
Satellite dishes are not illegal because satellite TV is not illegal. (Edit1: I am wrong.)
Edit1: Satellite dishes have apparently been illegal since 1994; https://en.wikipedia.org/wiki/Television_in_Iran
Regardless, my focus was not on the legality of dishes, but the amount of people who have them.
With 40-70 percent of households owning a satellite dish, even after being illegal for over 20 years, it seems unlikely that Toosheh is more "dangerous" than the limited internet that Iran already has.