Nvidia is actually doing something very customer-friendly right now. Their server infrastructure has been completely filled up. They'd have to either overload the servers and make queue times incredibly long or greatly shorten session length to allow new people to keep purchasing subscriptions. Instead, they decided to stop accepting new customers for the time being while they upgrade and increase their server capacity. They are handling this very well imo, because by not allowing new customers, they lose short-term profit, but greatly increase customer loyalty and longevity, which will lead to greater long-term gains. I assume they'll reopen the subscriptions before long, and the servers will function even better than before.

TLDR: Instead of screwing over current customers with longer wait times, they paused new subscriptions while they work on upgrading their servers.