As someone who used to have actually slow phones before: this will not help your doom-scrolling. You will still doom-scroll, but you'll just be frustrated and miserable due to the lags. You're welcome.
I think it’s a valiant effort. Sometimes having multiple influences can make it easier to change behavior.
Have you tried using NoScript? Works for me (except HN).
My solution to doom scrolling on the desktop was to edit my /etc/hosts file to disallow me from going to the offending sites. After a few weeks, the habit was broken and I didn't even miss them anymore.