No matter you seeing it wrongly as TV license fee it is not longer that, it is a new tax for public TV, hence it doesn't matter whether you are watching TV or not.
Which is why it's perfectly legal in the eyes of the law. I might not agree with it, but there's nothing illegal about it.
Ah and few foreigners who are struggling with Polish language and hence do not watch Polish TV anyways do not count due to their small number.
And people like me that own a large TV but never watch live TV - I only ever watch documentaries and other interesting programmes through catch-up TV, never anything on live TV. Or I use it to play games on - I don't even have a TV aerial connected, nor am I connected to any sort of cable system. Plenty of people are similar - live TV just isn't worth watching. Why bother, when Netflix, Youtube, on-demand services and a few others provide all you can possibly want?