For the majority of people it's the opposite of utility. Not even inutility or uselessness, it's negatively useful.

In any social network where "network effects" are a thing in the first place, there is more content produced than can be consumed by a particular user. The algorithm (tm) is forced to curate certain pieces of content out of circulation and can only heavily promote a negligible minority of content. This creates content reach distribution that is essentially a parabola. While there can be tons of signals to adjust the reach, the primary signals are inevitably going to be virality of the account and early engagement. You can't reasonably look at long term engagement due to content to eyeball ratio.

Ergo, posts must be designed to quickly grab early attention in an infinite feedback loop and this incentivizes cartels and bot farms to create echo chambers. Both extremely harmful phenomena.