I didnt see it as voluntary, the text was not readable and it said something like "To read this article subscribe £1 for a months access"
Anyway I'm not going to lose sleep over it, 99% of newspaper articles are the work of expert fiction writers. If I go to Scotland and a policeman asks me for money, if he has a gun obviously I'll pay it. If one of those spy cameras sends me a bill I will ask where the notice was posted, conforming to the parking regulations currently in force.
I've officially lost interest.