The text on the button on their site was “purchase” as of a few years ago (it’s now “reserve”). Also, the apartment analogy is a good one. There are a lot of clauses in apartment leases which can get your lease revoked. In no case would it be ok for you to have made an archival copy of the key to keep access.

>Imagine buying (purchasing) an apartment at full price, and after a year or two living there, someone comes and "we made a whoopsie with our licences, we need your apartment back".

2008 housing crash in a nutshell. Your metaphor would work if you were rich enough to not require a mortgage and can truly buy it outright, but the vast majority of people don't "buy a house", unfortunately. They seek a mortgage (fancy term for "loan"), the seller gives the home to the bank, and the buyer gains the deed when they pay off the loan, likely for an amount greater than the cost of the home.

This is just a huge tangent, but your example was a sad reality for some unlucky "homeowners" when the system failed.