First, having a Free computer doesn't prevent you from also having a corporate terminal. Devices are inexpensive these days, especially used devices that can have Free software installed onto them.

Second, phones are a terrible platform for privacy preserving technologies, both currently (mobile OS dumpster fire) and intrinsically (lower resources, poor input, well-known network identity). Anybody who cares about digital privacy should have a real computer laptop/desktop that they use for the bulk of their activities.