The way I understand doom scrolling (and all other forms of passive engagement, e.g. youtube, reddit, hacker news, etc.) is that when we dip below "baseline" mood (be it through stress or any kind of adversity), quick hits of stimuli momentarily bring us back up to that baseline.

At the same time, access to abundant entertainment establishes in us an unrealistically high baseline that we're destined to fall below whenever we're not actively "plugged in". When you fall below baseline, unrealistic though it may be, you feel lacking, like an addict, and you respond to that feeling exactly like an addict.

It's all too easy nowadays to forget that boredom is good. Adversity is good. Having the time to sit with your thoughts is good. We grow stronger through any form of perseverance, and weaker through any form of surrender.