So.. recently india gov banned over 100+ chinese app including pubg mobile. i dont understand what kind of data will a game collects? what can you do with those datas? any thoughts?

home address, phone number, credit card details maybe more..just to spy and see what you are interested in (clothes, Appliances.. etc)

source: BBQ

Additionally: Your location, who you talk to, what your camera sees and your microphone hears, the possibilities are endless.

They probably don't do all of them, but in theory, they could figure out most of your life by having access to your phone

They could pull a Facebook and record your screen while not using the app as well.

https://fossbytes.com/fitness-tracker-app-reveales-secret-us-army-locations-on-global-heat-map/

Just please, don't forget that Google does all the same. Google Play Services are pre-installed on every Android phone. Not even 0.1% of people bother to actually get rid of that and use "Ungoogled" firmware, that takes some time to install and get running.

You are tracked and your data (interests) are collected to be sold for ad placement. It's profit. Selling your data is profit. That's why Google can keep pushing millions into Chrome because it secures their own monopoly, while Firefox - who tried (at least somewhat) not to totally sell you - failed.

Can the government use that? They can and they will. https://www.theverge.com/2020/3/7/21169533/florida-google-runkeeper-geofence-police-privacy