Most likely that the Hungarian government just hates the internet and the power it brings to people. This tax is a way to ‘shut off’ the internet. Just at the tax on advertisement income, which targeted just the commercial (non state owned) TV station RTL. The European Commision is looking into this: Media freedom remains under threat in Hungary with quite strong language.
The country also has a problem in that the constitution allows itself to be changed by a single government. And the current government is (ab)using that.
