These are very good points. The beverages in the microkitchen are a public good not your own property. Hence it’s not the same as “not donating to charity” as y

These are very good points. The beverages in the microkitchen are a public good not your own property. Hence it’s not the same as “not donating to charity” as you’ve so well described. I’d also add (leaving any empathy questions aside), that behaving in a solely egoistic, yet “lawful” way is still a bad strategy in mid- to long-term. Even if its utility in the short term seems great. The problem here is that you would be playing a zero-sum game, when everyone else is playing a positive-sum game. Meaning you would be constantly choosing a suboptimal strategy making the most optimal choice for other players to cooperate against you until you are out of the game.