Using banking apps on a phone is dangerous because if your phone gets hacked (and Linux kernel has extremely large attack surface), the attacker gets access to both the app's session and SMS codes that are used to confirm operations. People who use banking apps must be crazy or don't care about their money.
I think I do. It costs money and people in general don't appreciate it. Also while "malware on phone stealing money" is technically possible, it doesn't happen (much?), and most people get scammed in easier and more effective ways (see crypto) instead.
