I hate ads as much as everyone else (and actively block the hell out of it)
At the same time, ads made a lot of the free web possible.
I run services making money with ads: I would not be able to work on them without.
Or maybe the revenue I would make is too little to bother with all the stupid EU regulations around VAT - ads offer a simple solution and you get a single B2B transaction, while providing values to Customers.
If we had easy to use cheap (or free? I'm sure we can work out a model based on profiting off the analytics alone if we streamline the service and don't become as bloated as VISA / Mastercard) microtransactions with low fees and no ***ing bureaucrauts, maybe ads would not be needed as much.
But we don't. And a big chunk of the last 20 years of internet innovations was sponsored with ads money.