US economy service is not found in the rate card. Is it cancelled? What about my previous auto-fulfillment orders? Will they auto-fulfilled as well?

Since the new rate card is effective on January 18, orders will not be automatically fulfilled. Based on your own situation, It is recommended that you opt out of "join eF" before the new rate card takes effect on January 18, and then rejoin eF after it is effective. You can select the corresponding standard or express delivery service.