Walmart Stealth?

So I'm pretty acclimated with amazon and ebay, I also know from my reading some ppl also do etsy stealth's, but I have thought about getting into the Walmart game, but when I apply myself or with friend (non stealth) they either never respond or deny the app. I wanted to see if anyone here had any experience with
a) selling with Walmart in general?(like is it worth it)
b) Has anyone created any stealth with Walmart and how their experience with that has been such as verification etc ?
c) Also advice on good sales platforms aside from the 4 mentioned?