Tax here is not what most might think it is. What they want to do with money from this "tax" is to finance government-driven bodies which will 'educate' the public about media manipulation. Today we already see what the government means by that - they own state media and amount of hate and misinformation spilling out of them is horrendous. My parents remember exact type of narrative from when the communists had their best time in Poland.
1. through advertisements of national companies put in selected media outlets
2. through direct ownership. The largest national company - Orlen - purchased a large set of local publishers "Polska Press".
Effectively, the new tax will be a burden only to the media that do not support the government.