I feel like a ~$10M/yr foundation to fund hundreds of the "Some Guy In Nebraska" people (
https://xkcd.com/2347/) on a modest stipend would be easily worthwhile for any one of the tech giants, even understanding the free rider effect. Some of their thousands of engineers are being paid high six or seven figures, and every single minute of their time spent figuring out how some dependency has changed and broken compatibility adds up very quickly. Just paying them to sit on their hands and not let anything break by some kind of hostile takeover, like an intelligence agency quietly paying people to keep quiet.