For the game devs: how about taking under consideration this option:
We do a second charity event for BCRF or some other charity and offer the Sombra skin this time? This would erase a lot of the negativity around this now, and probably make some research charity 10 million or more dollars again…
Whats the charity?
‘Crusading these demons up in dis krypt yo!’ 
BCRF
Breast Cancer Research Foundation
Good question - it doesn’t really matter to me - headstart for hamsters - whatever.
I would donate to help demon hunters keep our streets safe
carry on my wayward sun intensifies
If they’re looking to make good on their wording that it would be made available in the future, charity fundraising is definitely my favorite avenue for it.
Come on Blizzard - just think about it you know?
You can once again help a charity and assuage the community and gain good Karma! What’s to lose?
Who’s this we you speak of?
We the People 
So there’s only a donation incentive for people who didn’t get the skin the first time? 
That sounds kind of awkward.
They didn’t get the skin because it was behind a $40 paywall - make it like the ‘Mercy BCRF fund and everyone wins, including Blizzard.