Easy. They already announced that they have a huge number of slots for this early access and I also believe the number will be so huge, that it won't even get maxed out at all and they will rather end it after a specific time then having all slots sold.
That they have different timed releases, even days later in Japan as example confirms this theory a bit.
It's hilarious how many people act here like it's potentially gone after 10 minutes. I don't think they want this shitstorm. So they probably doubled or tripled the slots from the beta and when they see it's not going up anymore or 2 weeks past by then they end it.
i acted like this cause the beta was badly handed, not blaming media molecule of course, but considering what happened, it's legitimate to be affraid that you won't be able to get the early access if you have to wait 10 hours after release before being able to get it
But since i will be there for the release time, i'm happy, can't wait to buy it