Every time I start my Google Chrome I get this amazon.com membership rewards pop up. I have my Chrome browser set to block pop ups on the Internet, but they come through every single time.
Those amazon.com membership rewards pop ups are misleading advertising. If your browser opens automatically to this scam then it is possible that your computer is infected with an adware.
Check your computer for adware and malware with AdwCleaner or Zemana Anti-malware or follow the full guide: http://www.myantispyware.com/2017/06/22/congratulations-amazon-user-pop-up-how-to-remove-chrome-firefox-ie-edge/