The world simply does not need profit-motivated online content. The internet can be a place for physical business to interact with customers and individuals/groups to share their ideas and art. None of that requires ad funding. The only thing that does require advertising for revenue (and is of any value) is reporting work, and they're struggling in the current model anyway. What great conveniences are you worried about losing? Social media sites? Forums existed without any funding but donations. Maps? OSM and Apple Maps exist. YouTube? Free video hosting is more expensive to operate than other media, but I'd bet nerds would rig up some near-seamless webtorrent protocol for embedding and sharing video with distributed load. The people making YouTube/online content? They're mostly fan-supported via patron relationships anyway. If advertising were banned overnight there would be maybe a month of readjustments, a few tech companies would have to pivot, and then life would go on but be a bit less shitty.
