Doing the maths
150 forints (£0.38, €0.50) per gigabyte of traffic, the tax would be charged to internet service providers... As a result of the protest Orban promised to cap the new tax at 700 forints (£1.78, €2.26) per month.
So, once capped, that will be 2400 forints (£21.36, €27.12) per year, per ISP.
There seem to be about 35 ISPs (www.iszt.hu/iszt) so a grand total of 84000 forints (£748, €949) per year revenue.
Hardly seems worth pursuing it unless the government are planning on removing the cap later, and pursuing it suggests they do.