An advertising company controls the user agent everyone uses to access the internet, and wants to shove more ads into your eyeballs. uBlock exists as long as they allow it. Anyone who disagrees with this, works for them or own shares in the company.

So UBO isn't doomed, just UBO on Chrome. While that's significant given Chrome's market share, I and everyone else on the planet have the option to use something else, and will continue to do so.