The reason why is because Verizon didn't want to participate. If you want, when the beta comes to the U.S you can download the update.zip and sideload it through an SD card to get the beta anyway. As a plus all the Verizon bloatware will be gone afterwards. I do it for all my phones.
I keep checking the members app every few hours just incase it pops up. Sounds like it already has a few bugs since it was rolled out to s10 devices, so maybe the longer wait will help the update to be more stable for all us Noters out there.