This gives a very interesting data point to the "open-source" vs. "free software" debate. Normally free/libre software zealots would tout BSD/ISC/Apache licenses as a way to never get back any downstream changes. And yet - cloudflare did contribute back nicely to a BSD-licensed project, in a situation where they were absolutely not under an obligation to do so.

In fact, even GPLv2 would not have imposed an obligation to publish changes here, only a super-strict GPLv3 would.

One data point of course, hardly warrant a far-reaching conclusion; still - that is something very nice to see.