The worse is doomscrolling, why? because it's "doom" not just a normal scrolling. You're comparing an addiction vs normal activity, obviously addiction will harm than the normal activity, pay attention with what you wrote.
we both doomscroll or gamble when we are bored. what do you think is worse, gambling or doomscrolling?
Gambling when we are bored is fine as long as we control the budget and the maximum time we spent for gambling.
But if we talk about money spending, then it seems that it's better to scroll than losing money in gambling.
Time is money, so scrolling endlessly without any reason could be said as losing money too.