I hate a lot of things about advertising, but "If your product is good, then you wouldn't need to advertise" is a very naive take. In spite of my aversion to ads, I see some concrete benefits:
- new and upcoming products - think Tesla in 2010, or Signal messenger in 2020/21
- making things accessible for those who can't afford them - I know a lot of folks who'd rather watch YT ads than fork over 15$ to Google every month. They simply don't have that much money
- letting me know about stuff I was not thinking about but am happy to know now - eg. interesting summer camps for my kids