Yes, I'm guessing Google would want to get all their HTTP-using apps switched over to QUIC (and adopting any other HTTP-level network improvements they come up with), so they'd want to encourage at least their own developers to switch from libcurl to something built on cronet and picking up performance tweaks as soon as they add them to cronet.

Seems like they should also be helping libcurl itself to keep up with HTTP-level networking changes though, given all the software built on it.