I think it would be extremely confusing for customers if the steam “Buy” button was renamed to “Rent” or “Lease”.
How could it be confusing when that's actually what happens? Imagine HN showed "Delete comment" instead of "Reply" under the comment input, don't you agree that be misleading?
how about "Purchase License"
It would only be confusing because customers are currently being misled and the new label would no longer match their faulty mental model.