"Flash has caused so much grief for so many people. It is clear that sites that make heavy use of it have a lot to answer for."
Yes, especially considering that people with phones and certain kinds of intarweb service PAY FOR BANDWIDTH OVERAGES one way or another (either speed throttling, or extra $ paid to telco) so those IRRITATING ADVERTISEMENTS are AS BAD AS E-MAIL SPAM, as if your weekly advertisement dead-tree junkmail was ALL! SENT! WITH! POSTAGE! DUE!!!
So Microsoft "grew a clue" today. Good. Job. <slow clap>
(if advertisers could do it, they'd reach out of our monitors and rub our noses in the ads)