I'm trying to do a thing and you've put this colorful flashy box in front of it.
Imagine if people tried to "monetize" their conversations. They might claim that otherwise they couldn't afford to talk to anyone (rent ain't gonna pay itself, right).
You'd be talking about football or whatever and suddenly a different tone of voice would emanate from your conversational partner for 10 seconds whilst they talk about some Super New Product.
As far as I can tell the whole industry is impolite, rude, gauche, just a bit icky, really.
I live in a city that has a characteristic mountain. So, naturally, advertisers are placing their towering billboards so that they constantly block the view when you're driving on the avenue that would have the best unimpeded line of sight.
What do you think the cost would be for these free things without advertising?
The biggest downside I can think of is while I would happily pay for Google search (per search, subscription, whatever) in an ad free world, there's lots of people who simply wouldn't bother to search and learn new things.
Really though I think they have a good model for their search page, it's unobtrusive and not rude, and it made them the most powerful tech company in silicon valley, so clearly it works. Wonder why other adtechs had to get so much shittier about it.
I just know that I do in fact have these things today because of advertising.
But free tshirts are pretty nifty.
It was (maybe still is) particularly annoying on Bitcoin forums for example, where signatures can contain images.
People do try to monetize their conversations. That's why "networking" is a different word than "socializing".
This holds true for a lot of things related to sales & advertising - if you tried to repeat the same practices in person to your family or friend, you'd get distaste or a punch in the face.