So far I have not had a bad autoplay problem on iOS. However a growing problem is obnoxious pop up ads that are difficult to escape.
Overall more of my Internet usage is shifting to apps because the Web is just too annoying. Years ago the Web was like a friendly, boisterous marketplace in a safe town. Now it's like the street in "Casablanca" where I must constantly guard against someone picking my pocket. It's not worth using except for a few sites I trust.
Google in particular had better watch out. With Web hostility their search is not as useful. One reaction of theirs has been to pack more information directly into their search result.