[Update 12/9/19: Some on r/churning are reporting their credits have now been clawed back. Others are still seeing their credit intact.]
The American Express Platinum card offers a $15 monthly Uber credit; during the month of December the credit is bumped up to $35. Those who have cancelled their Platinum cards during 2019 are seeing today the $35 credit pop up, despite the fact that they have not been getting these credits after the cancellation.
Apparently, the $35 credit is coded separately and goes out to everyone who was a Platinum cardholder during the year. It may or may not be intentional, but regardless, it’s useful to know and not let the credit go to waste.
Hat tip to GonadGirl