Is Kuiper's spectrum situation any better than Starlink's? From what I've read, Starlink and OneWeb have priority over Kuiper for the same spectrum (since they were approved first).

I feel like we are arguing two different things. I was saying Kuiper can't beat Starlink. You are arguing Starlink is not going to succeed. I'm more optimistic about its prospects than you are, but even if you are right, it wouldn't change my original point – if both fail, then Kuiper still doesn't beat Starlink.