I want to get peoples opinions on something^^'

I'm from Germany as you guys may or may not know and well my father has lived now in his flat for more then 30 years, about 20 years ago he sat up a satellite dish on his balcony and no one ever complained. Now the company who owns the houses totally renovates the outside of them and my father received a letter saying satellite dishes are no longer allowed. All fine to that point, however later the letter states if the hirer is of Russian, Turkish etc. nationality he/she is allowed to keep his/her dish.

Imho that's plain unfair and wrong. Why can't natives have a satellite dish in their own country but others can?
My father is thinking of suing the company but he isn't sure...