It's a lot worse. It's like comparing a bow and arrow to an M-16. Yes they both shoot projectiles, but...

The quantity is endless. You can run out of channels, sweep through them a few times, give up, and get bored, while doom scrollers give you an infinite stream of faux-novelty. It's entirely possible to scroll for eternity and never run out of what at least seems, to your limbic system, like information and social stimulation.

The content is generally much lower quality than TV. Even really bad dumb TV is high art compared to a lot of what's on the doom scrollers. It's hyper-optimized for narrow addictiveness and literally nothing else.

There's a closed feedback loop optimization system in place. The site knows you're scrolling. It knows how fast, where you pause, in some cases even where your eyeballs are going. It knows what makes you interact. It knows what you watched before you stopped watching vs what you watched and kept watching. It also has tons of third party data on you and sensor data that often even includes your location. It can optimize its addiction mechanism in a personalized rapid feedback closed loop way that television could never achieve.

It's like a smart drug that tries to keep you hooked. Imagine if the heroin had a learning algorithm that adapted its chemical structure in real time to keep you from quitting and it was powered by fleet-wide learning cross all heroin molecules in the world.