Apple will give developers US$500 for returning its Developer Transition Kit, a US$300 increase from the value of its original credit. The new coupon is no longer restricted to being redeemed against M1 hardware either and can be used until the end of 2021.
https://www.notebookcheck.net/Apple-is-doing-the-right-thing-by-developers-with-its-Developer-Transition-Kit-credit-increase.519391.0.html
Well, I'm going to give it to Apple this time: I was expecting them to not do anything about this, but it seems they do care about their public image after all.