On Primal at least because the largest zap has a text preview allowing others to advertise on popular notes
In this example, I can zap myself 41 sats, claiming the top spot and dethroning the advertiser on my post
Discussion
Oh that's so damn cool!! I didn't even realize that was a usecase for zap notes!! That's awesome that they exist, and that there's such an easy mechanism to compete for attention haha!
That's not part of the UX on Amethyst.
You need to expand the reactions & zaps to see any zap notes.