It's very interesting how you can opt out, when you would think, given the very small percentage of people who show interest, it would make more sense to ask interested people to opt in. I wonder why they don't do that....
Then again, maybe there's a reason why websites don't automatically switch off all cookies and just wait for those who do want them to get in touch to request them....
I remember when this first came in: Royal Mail forcing their posties to stuff unaddressed junk through every letterbox. It must make their jobs much longer too, as they presumably now have to deliver to every address, whether or not they have any actual post that day.
RM claimed it was essential for them to help balance the books now that far fewer people send letters and bills in the post. Even so, it's still annoying that somebody is actually putting rubbish through your letterbox. In principle, if it's something you have no interest in whatsoever, it's no different from somebody stuffing an empty crisp packet or banana skin through your door.
At first, I made a point of saving all of their leaflets up and then posting them back into a postbox, but I soon gave up as it was taking me more effort than them! Plus the person emptying the postbox won't be the one who decided to start taking in junk mail for profit.
I get that a narrow range of people who aren't online may be interested in some of it, but the 'people in poverty' mentioned by PP are thus probably not in the market for a new conservatory or frequent takeaways. It's also probably unpleasant for vegetarians and vegans to have their own homes 'invaded' with full-colour pictures of meaty takeaways and imploring them to eat them.
Worst by far, though, have to be the endless charity bags - the ones that, even if you do fill them and leave them out for collection, nobody ever comes for. We learnt that ages ago so wouldn't bother at all now: they're just (rubbish quality) bin bags as far as we're concerned, supplied by a charity that must presumably have far more money in its coffers than it can use for actual charitable purposes.