https://wowup.io/guide/get-addons/overview
Scroll down a bit and it says this...
Sources
Not all providers have a way to pull a list of available addons, currently addons from WowUpHub, CurseForge, and TukUI are listed here.
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Update
I just looked at MMOC and it looks like Wowup will soon not be able to pull from Curse. Gotta love stingy corporations.