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Except they're clearly trying to profit off of customer confusion. It's one thing to copy a business model, it's another thing to copy a company.

but didn't the article say that the brothers launched in markets that the original had yet to enter?

It's not like they're setting up brick and mortar stores. Pinterest is just as available in Germany as it is in the US.

Not true, they're playing hard to get. They're not open for everybody, although, sure, the limit isn't geographical