Less than 5%...
Do you know how many people live in China?
3 publicly visible posts • joined 29 Jul 2013
The Apache license is approved by the FSF:
https://www.gnu.org/licenses/license-list.html#apache2
The licensing concern is that Android includes non-Apache and non-free licensed sofware, specifically certain drivers and firmware blobs. And the parts that are licensed under the Apache license are regularly modified and released under a proprietary license by Android vendors.
By the way, Replicant contains a lot of the same Apache-licensed software. It is not a GPL-only campaign (although many FSF and GNU followers do prefer the GPL).