el3n1: If verifying scores were the reason, it seems inappropriate to hand out the initial 156 while holding up the last 14.
That's why it's not the reason in that meaning, they probably just mean checking/verifying the other ties.
As you said earlier this has happened in previous years, no idea why it takes so long but it just seems to, maybe they wait until after the four rounds are played (?)
They really have to pay it as they said they would:
USGA Virtual Open Prizes
Three random sweepstakes players will win a $250 e-gift card to the USGA store. In addition, the top 156 scores (plus ties) will each receive 2,000 WGT Credits and will advance to the Virtual U.S. Open Championship rounds where the top 10 scores will qualify for the Live Stream Finals. See rules for details.