I had to scroll way too far down the pageto find this (i trynot to duplicateanother's comments). At the core of some of thescummy advertisements is profiling, enhanced by privacy violations. Remove the abikity to track you around the internet and IRL and advertisements become less obtrusive.
The other side of the coin is that it costs so little to add adverts to a web page, so why not collect a little cash to help offset your hosting costs? Remove the profiling and Google & friends don't have a leg to stand on, so then when you visit a cooking blog you see ads for kitchen utensils. No biggie. Looking for auto repair articles? Check out this awesome wrench! At least you now don't go to show your mom some wedding venue you're thinking about renting alongside an ad for ED meds from the dark market.
I haven't heard about the terrible longevity. They even top the consumer reports list for EVs. What sorts of longevity issues are there?