Android phones are also effectively proprietary (especially phones from manufacturers such as Samsung and Xiaomi) and seemingly get slower over time. But yes, the apps are cheaper/free thanks to sideloading and a good community.
(RMS-Mode On) What I'm referring to as Android, is in fact, Google/Android, or as I’ve recently taken to calling it, Google plus Android. Android is not (really) a usable operating system unto itself (for most people), but rather another component of a fully functioning Google system made useful by the Google Apps, Google Play Services and vital system components comprising a full OS as defined by the end user. (RMS-Mode Off)
If either way you're going to have a proprietary phone, you might as well pick the one that has less of an interest in data mining you.
Why the scare quotes?