Tax benefits for the company, they can now write off more as a loss, and failed stuff for sure. Plus lower taxes.
So actually really just helping them make more money, disguised as a them actually looking like they are doing some socially responsible charity benefit to society? EDIT: No, they are taxed the exact same way (not sure about writing off stuff), but they have to now be checked by 3rd party to see if what they are doing actually benefits society and environment... So they can't just operate and do anything to maximize profits if it goes against that mandate. A good P.R. move definitely, and they are going to give back some of the profits to help people and not just line their own pockets.
BUT.... What is their "benefit" to society if they ignore calls by backers to flag dubious campaigns? Sure they can make some more profit by accepting a bad scam campaign, then give it back to society. What about actually NOT accepting the bad campaign or listening to backers who complain? Wouldn't that be more important?