Overlap with desktop Linux means support for that is support for these mobile Linux distros, and desktop Linux gets support from a range of people and companies, not just Google.
Maybe? Depends on what costs dominate operations. I imagine Chinese electricity is cheap but building new data centres is likely much cheaper % wise than countries like the US.
I think it might be confusion between inspecting plaintext metadata like SNI vs actually inspecting encrypted contents (e.g. HTTPS content, headers, etc.).
Overlap with desktop Linux means support for that is support for these mobile Linux distros, and desktop Linux gets support from a range of people and companies, not just Google.