okay, so a very reliable source on the Drag Race spoilers subreddit (who has accurately spoiled each episode this season in great detail the day before they aired - apparently they get sent the episodes in advance?) has posted the following after watching the finale,
including who apparently wins:
Spoiler:
"Hi all, so I have some work to do so I can't do a full recap just yet. But I skipped to the end and here's some quick details:
Survivor by Destiny's Child final lip sync with all 3 finalists
I don't immediately get the reference Crystal is making with her lip sync outfit; it's an orange wig, pink gloves, and lime green bow embellishments. That's not the full picture but again i dont really know what else to compare it to
Gigi is wearing a Dorothy-inspired look
Jaida is wearing an orange look that has a reveal
And the winner is...."
[extra spoiler tag added by me, in case you accidentally clicked the first one]
There's always a chance that this person received a decoy edit of the episode (or have decided to lie for the hell of it) so feel free to take it with a pinch of salt, but as I said they've been 100% spot-on with everything else they've posted up to this point