My guess is that Delta is trying to get ahead of possible legislation against them in Congress. Try and fix it your way or have regulations stuffed down your throat by Washington. It may happen anyway depending on how elections go later this year.
If politicians, actors, whoever want to scream and cry about climate change and the CO2 emissions from planes, they should be the first ones to stop flying them, but that never happens. Here’s one recent example:
https://liveandletsfly.boardingarea....s-first-class/