Is the built-in wallet open source? If not then avoid using it. Remember what Andreas Antonopoulos always says: "
not your keys, not your bitcoins".
Tbh, avoid using Opera, some shady stuff going on with that company lately:
https://www.extremetech.com/internet/305149-opera-accused-of-operating-predatory-loan-apps-on-androidThis is incredible! This would further expose bitcoin to other users <...>
Not really, not many people use Opera browser. You can google "browser market share" and you'll see how terrible Opera's numbers are compared to other browsers.