>To first approximation, no one provides any essential service for free.
That's pay.
Profit is proportional to capital, not effort (even if it requires effort to materialise). Wage or earnings don't prodce the same pathological effects as profit, even if one person earns $500/hr and another earns $5/hr, the inequity and power imbalance is a constant and relatively quite small compared to exponential inequity entailed by making earnings proportional to wealth.
The assertion that a factory, or a 1000 hectare farm, or a house that you don't live in can be owned is a positive statement, not a brute fact of the world, or a necessary consequency of commerce and trade. As soon as you maoe that statement you are saying that owning these things entitles the owner or shareholder to an exponentially increasing share of control over the world and other people while your farmer and garbage man slowly go bankrupt.