Also, only using allocated spectrum. Starlink Direct-to-Cell requires partnership with mobile providers that hold that spectrum, like T-Mobile. Terrestrial network using those frequencies would probably swamp the signal from space. Legally, Starlink can't use those frequencies without permission from each country.
India sees the ability for anyone to anonymously post things on the Internet as all kinds of stupid, and heavily regulates the access to the Internet so any in-country activity can be tracked back to an individual.
There's no way to put the smartphone genie back in the bottle and there's no way to visually differentiate satelote capable phones. It's going to be easy to smuggle them across borders.
Maybe, but would you currently like to go to india with a satellite capable device?
And in the future I can imagine mandatory software that needs to be installed in many countries, to be able to do any buisness there.
Not specifically against satellites - but for using the bus, paying the hotel, getting a appointment at the police, ... and that app would make sure, you only connect to authorized means of communication.
The hard part will be preventing that shit to become universal.