Coke will be fine if they stop buying TV spots (for a while, at least) but I'm pretty sure Linear/Datadog etc wouldn't be the size they are now without advertising.
> The main reason businesses need to rely on advertising to reach people is because people are already being bombarded by competitors.
Fundamentally, advertising is a way to tell potential customers you exist. Most people don't seek out new products, how do you think small businesses would grow in a world with no advertising?
The ADD incidence rate being 10x for adults since 2005 (not to even mention kids), we'd all appreciate relevance to what we're exploring/thinking about/learning, rather than the genuine nuisance of nagging for something out of context because we're tracked all around the web.