Name three.
There are a lot of medical devices that help people with relatively minor or uncommon issues. Even doctors don’t always know about them. The companies that make them can’t usually afford to advertise on larger platforms, but they target ads to try and reach those affected.
Local consumer-facing businesses in general need local advertising to survive. This works better for some industries than others, but keeping a competitive space healthy requires some assistance getting a newer/smaller competitor’s message out.
AWS advertising generally has been a major contributor to the success of at least two companies I worked at.
I get reminded from time to time that I could saved quite a bit on my retirement fund if I switched to one with lower fees. One day an ad will probably hit me at the right moment and I'll actually do it.