An issue I have with these apps that claim to be for doomscrolling is that you don't open apps like Instagram or Facebook to doomscroll, you open them to check messages or stories. The doomscrolling is an afterthought. These things assume you can realize you're doomscrolling and not only break out of it, but choose to hypnotize yourself in their app.
This could be a product. I'd pay for an app that fwd'd messages from other apps and gave me a wikipedia feed to scroll on the elevator / other places where the phone is a social respite