Thank you for the explanation, Danny.
The problem is the type of intrusive pop-ups which they are now using. That includes those 'spyware' program offers which need about 6 clicks to make them $od off. Get it wrong and something invades your computer. That, to me, is NOT a reasonable form of advertising.
"Pay us more or you'll keep getting adverts and pop-ups" is little more than legalised blackmail - it needs to be stopped, in my opinion.