EA and Open Source isn't completely alien. Their C++ standard library EASTL was open sourced long ago and is a historically quite important and influential codebase in the history of C++'s evolution.

They've also open sourced and patent-pledged a bunch of gaming-relatee accessibility tech over the years.

And of course Micropolis/SimCity.

My advice is to celebrate the successes of large corporates in this regard very hard and often - this provides backup to the champions on the inside.