Commoditize your complement. That's what Google is doing with Android itself - flooding the market with a gaggle of surveillance-ready web browsers. But Apple could push back at an even deeper level by supporting user-loaded OS's, taking the Free community's focus away from the Android ecosystem.

The limited hardware combinations alone would be a boon to the Free community. Right now, I see Android as the Freer option, even though I've gone significantly out of my way to get there (Samsung Exynos + microG + fdroid). If I could do a similar amount of work on mainstream Apple hardware and end up with an OS that had no Google remnants, I can see my perspective changing quite readily.

Perhaps we'll see such a development when there emerges a Free OS that's a viable/cult-popular daily driver.