"Can you trade it? (If you can't trade it, it's not worth anything)"
I can not trade my Steem Power, does that make it worthless?

Not every coin is birthed onto an exchange...

"Who are the developers? (You need to know who the creators of the product are)"
Who made bitcoin? I mean besides the Satoshi name... Who is it? We don't know the creator but it's the number juan coin...

Edit: But that Onecoin stuff looks like garbage junkcoin...