Unless you're running Graphene or a similar security minded distro the sandboxing isn't very good. Okay let's be honest it's fairly abysmal at preventing fingerprinting. It could almost be accused of not even bothering to try.
But one example: https://news.ycombinator.com/item?id=43518866
The mobile operating system developed by the enormous ad tech company doesn't try to prevent fingerprinting?! :O
>Unless you're running Graphene or a similar security minded distro the sandboxing isn't very good
Grapheneos doesn't prevent the installed apps fingerprinting you linked either.
Even with graphene I don't believe it mitigates much as far as apps collecting data. The idea for more privacy is you run open source apps instead that just don't collect data.
AFAIK Graphene is oriented towards strong device security with privacy as more of a side effect.