It's not the ads that are the problem, it's the tracking. If you install something like Privacy Badger it will block all tracking, but not necessarily ads. However, because so many of the ads come bundled with a shit ton of tracking, they are effectively blocked.

There's nothing problematic about having Stihl advertise chainsaws on a page for lumberjack. There is a problem when you collect data from across the internet, conclude that a person might be a lumberjack and serve the chainsaw ads based on that information on a news site.

Sadly the advertising industry is mostly dead, at least online. We're left with online marketing experts that are basically just clicking around in Google and Meta ad-management interfaces. They know nothing about the sites or content, nor do they care. The magical box will find the customers... and if it gets it wrong, no worries, it wasn't their money anyway and you can always just go "Well, advertising isn't an exact science, some of your spending was always going to be wasted, you just don't know which part".

Now we're left with an online advertising industry that can't tell advertising and tracking apart, and it doesn't have the skills or the network to go directly to sites and buy ad-space.