It isn't generally a problem to hoard unused room. It is a problem to hoard unused room in an environment where room is scarce. It is not a problem to extract wealth from other people's work. It is a problem to extract money from other people's when you pay them wages from which they cannot live. It is not a problem to fill water into swimming pools, but it might be a problem if you are in a desert city and others need to ration water.

Context and amount matters deeply. People like Sam Altman often like to refer to utilitarian principles, when it helps further their goals. Whether that is really their true motivation can be seen in small things like whether they apply the same principles to the same decisions of their lifes.