You’re describing very different use cases. Face unlock isn’t AI. It’s just using biometrics to generate a very complex password. It should and can run locally, I wouldn’t trust any provider to actually keep it local though. Everything else you mentioned happens in the cloud. You need a good amount of processing power to generate the necessary output, which happens on server farms. Thats why Bezos is looking into nuclear reactors to feed his farms enough energy.
Totally my thoughts. I get shoved twice a week just walking around in town.