China requires all companies to hand them data whenever they want. In the West, there is at least a semblance of proper reason required for the law enforcement to demand your data.
I don't think that US government maintains a database of all the data of all the users of all US companies. But, for China, I would say, that is a non-zero amount of possibility.
Beyond usage data, there is telemetry in PC, and much more tracking is possible in android apps.
I had tracked Opera, Chrome, Brave, DDG, Bromite, and FF through both Tracker Control [0] and DDG's tracking monitoring in beta. Opera fairs much worse, and many shoddy, dark companies come up.
I am not a security specialist, but my advice would be to stay as far away from Chinese products as possible- in this case- Opera.
[0]: https://f-droid.org/en/packages/net.kollnig.missioncontrol.f...