Extended: Sign up for Rakuten and Earn $50 or 5,000 Amex or Bilt Points After Spending $50

Rakuten is one of the oldest — and remains one of the best — shopping portals on the internet for earning bonus rewards. And it's a great time to sign up. There's a new member bonus of $50, 5,000 Amex Membership Rewards points, or 5,000 Bilt Rewards Points. Here's how to get it.