The Telegraph have stopped doing it. I think they have now realised it's counter-productive. Hopefully, others will follow.

Incidentally, I also think it's now common knowledge that unsubscribing will, in most case, initiate a lower price offer.

I've used the Times a handful of times as a student. It's always painful when student discount ends and you ring up and say I can't afford £26 a month. They'll drop it to £10 then £5 but they never match my student price. I've had to leave during bachelors and professional qualifications.