I have twice recently gotten emails looking very much like promo emails from Amex, offering sign up bonuses that exceed the bonus that is currently available from Amex directly. One was for 100K bonus on regular Hilton and another for 150K bonus for Ascend. When you hover over the links however, they are from odd third parties such as "yankeebitcoin.com", "vivaforvacations.com", etc.

So I assume these are likely bogus, though 3rd parties do hawk credit cards for their own profit. Just wondered if this was a known scam/phish attempt or if anyone actually had any experience with receiving a signup bonus via a 3rd party company that you didn't see available directly through Amex?