La liga wants to get rid of illegal streams so they can ask for more money for the licenses.

Paid Streaming or TV is quite expensive. It's mostly because you have to buy the whole package which includes everything else the company provides. Like Golf or Nascar or whatever they find on ESPN 8.

Also paying for a stream only really benefits the rich clubs. The money la liga earns for tv rights is split between professional teams with Barcelona and the two Madrids receiving about 30% of the money. The other 17 teams get the rest. Some fans don't want to see them getting more money (small percentage but never underestimate fans)