Very interesting. This could possibly explain why I was seeing a sudden resurgence of early times for SDD at about 7:10, which I hypothesized as possibly a second drop:
https://www.disboards.com/threads/2nd-drop-of-sdd-ll.3858403/
Except that SDD isn't an ILL$, so there wouldn't be a payment page with a 10-minute hold.
But I can see that an ILL$ attraction (like Rise) might suddenly have earlier availability after 7:10 if some folks booked at 7:00 but were not able to complete their payment within 10 minutes.
EDITED TO ADD: Come to think of it, maybe there are folks at 7am who try to book a
Genie+ LL, who haven't already paid their $15 so their selection is also put on hold for 10 minutes so they can pay. If so, that could mean that 7:10+ is your second chance for an LL (Genie+ or ILL$) if you struck out at 7:00.