Why are presale items allowed on eBay?

I don’t understand why eBay allows sellers to list items as “presales” when the site that the item is coming from doesn’t even have them available yet. Maybe this is a hot take, but you shouldn’t be able to sell an item that you don’t own yet.
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marnotom!
Community Member
Perhaps the bigger question is, “Why do people purchase from presale listings when the site that the item is coming from doesn’t even have it available yet?”