It's not like I'm some superman to notice this stuff. People know they shouldn't scroll IG all day or eat McDonald's for every meal. It might play into subconscious biases but ultimately people are consciously aware of their behaviors in the macro.
What's disingenuous is to think that only smart/savvy people know that the app equivalent of junk food is bad. Personally, I grow really tired of this (seemingly pervasive) viewpoint that the everyman is clueless and helpless and will be totally fucked if we, the learned/savvy, do not intervene. (Apologies in advance if this is not your view - I am complaining about a wider problem more so than replying to your specific comment.)
It's a seductive viewpoint, and one that seems to tickle the "but it's obvious" common sense. I don't think it's true, though, despite being very plausible.
Casinos exist, with way more extensive and battle-tested addiction-response features than the Facebook app, and the vast majority of people in the cities in which they operate don't go broke pouring their life savings into the machines.
Give the everyman some credit.