As noted by MacRumors, Apple has reduced trade-in values for the MacBook Pro, MacBook Air, MacBook, iMac, iMac Pro, Mac Pro, Mac mini, iPad Pro, iPad Air, iPad, iPad mini, Apple Watch Series 3 through Apple Watch Series 6, Apple Watch SE, and select Samsung and Google smartphones.
Apple is also no longer accepting Apple Watch Series 2 trade-ins. iPhone trade-in values are unchanged. You can find the new trade-in values here.