Adagio, I don’t think they will close access on the 28th. Firstly, by that time, it will already be possible to complete the rather limited number of maps that are available. Secondly, the game requires the key to be entered twice: when downloading the file and immediately after installation. Therefore, if someone somehow extends the key, and someone else doesn’t, the system won’t be able to distinguish between these two cases without additional tricks.
P.S. I posted the NDA, so what claims could there be, I don’t understand?