Fabricants use to put a lot of ridiculous, illegal and draconian clauses in their licenses and it works!
It works because people are ignorant of the legal system and laws, people are ignorant of their rights, people believe in the urban legend version of the laws many times promoted by the media that of course, is payed by the same fabricants.
If some person is aware of the laws and their own rights and ignore the illegal clauses, the fabricant cannot do anything against, he will do nothing because he knows very well that his claim will never be accepted by the justice.
But as I said before, most of the people are ignorant, lawyers continue to send illegal letters full of threats without any legal value and ignorant people are frightened and obbey them, so it works!!!....

Stupidity also evolves!