The "socially-enforced expectation" is the same. You know whether you're doing something altruistically for the common good, or whether you're doing it because if you don't others will try to shame you.
As soon as you introduce coercion, the type of people motivated by power are attracted to the power to coerce and corruption takes root.
Typically there's a cultural expectation of "wellbeing for all", which becomes a significant social expectation. If it's the cultural standard, it changes the relationship to chores significantly - I can contribute to them knowing that the general person out there is also doing chores with my wellbeing in mind.