Why the hell should we "mother may I" with Google for running apps on our own phones if it isn't sourced from the Play Store?
The "security" rationale is horseshit given just how much malware is readily download able on the Play Store. Google never cleans its own house before going after others.
It's not just the US, story through the grapevine is that Google is under a lot of pressure Asian governments over "online scams".
(Allegedly the main actor behind this push is Singapore)
It's not about malware. It's about Google complying with USA's geopolitical adventures.
Basically, Google needs an answer when men in suits ask them why they have technology that enables users to install sanctioned Iranian banking apps.
Somehow if you replace Google with Apple in the same sentence you'll get cursed to hell. Go figure.
Don't you know? If one elderly person gets scammed we all deserve to be infantilized.