Well, if big companies can get carbon credits, why can't I? Biking a few miles a day should yield me some, shouldn't it? Because I'm not using a car? Sure, I breathe more, but it's still less CO2 than by using a car.
Once again, Arrowhead decided to go with Sony as publisher, they agreed with PSN account linking. No offense, they are are an independent studio, they did not need to do that. It is sad they lost money, but the developers already got paid. The worst thing that can happen is they have to switch jobs.
Maybe try with whatever website sold it to you. If it was gray shit like Kinuin, AlleyShop, G*A (censorship to not give them SEO), you are outta luck. If it was HumbleBundle, Fanatical, or other legit sites, it might be worth a try.