Google has this stack control in Android, Google Home, Chromebook, etc trivially if it chooses, if it doesn't have that already.
Microsoft can do this on its Cortana smart speakers and Surface Pro X running their (Qualcomms) ARM cpu.
Also I imagine bulk buyers can get Intel ME disabled if they don't want it on their server. AMD PSP can be disabled in the BIOS I believe.
Comparing a phone to a server doesn't make too much sense. A phone is a consumer product like Android or Home and a server is a business product. Apple runs its cloud on Intel or AMD like everyone else.