No it is not. The feed is optimized for what will increase the intensity of feelings, and bad feelings are more easily optimized than good. Meta (patient zero for this nonsense) has pretty much said so, multiple times.
" more a result of the environment than algorithms"
What environment? People are sitting on their algorithms for 100x more time than any physical environment.
The one seeing themselves or co-workers laid off while companies report record earnings.
The ones seeing a CEO tank a company then move on to the next company next week with a huge pay package.
The one seeing their little sibling or kid graduate with honors and multiple internships, and having the complete inability to get a job in their field.
Do I need to explain more? Media reflects reality at the end of the day. You acn talk about doomscrolling, but part of it only works because exaggeration always starts by exploiting some truth you've seen first hand.