Google is using anticompetitive measures to prevent the manufacture of devices that are sold with any forked version of Android.

(The crucial point is on page 3.) This is even more important than the steady replacement of free apps with nonfree.

The important aspect is that includes any free version of Android, such as Replicant. This is not quite the same as the way Microsoft abuses its power in the PC market, but it has comparable effects.

Of course, if you want freedom, you shouldn't use any of the Google APIs, and Google Play (offering so many nonfree apps) is something to run away from.

The article talks about "open source" rather than "free/libre software", seeking as usual to avoid ethical opposition to nonfree software. Please don't imitate that practice! The way to encourage other people to think in terms of freedom is to raise the freedom issue visibly whenever it is relevant.