People cite the tragedy of the commons to discourage sharing of resources. The idea that common land should be divvied up into private ownership to prevent them falling into ruin. When really shared resources just need accountability between the people who make use of them. It’s just basic game theory: If there is no cost to abusing your opponent, that strategy will get used. But if you’re going to be playing long term with the same people, systems will form to deter abuse.