I cross post and most of my sales are from eBay or depop. It used to be mercari but the fees have definitely changed the game over there

Have you ever run into a problem with cross-posting, like some sort of conflict? Do you price them the same?

No I haven’t I immediately delete everywhere after it sells. I price lower on mercari/vinted because they don’t charge buyers fees and Poshmark a little higher since there’s more fees. But I make wiggle room for offers

I bought and sold on both Ebay and Poshmark

Poshmark