Right, SafetyNet. I haven‘t tried banking apps (or anything else that requires SafetyNet) with microG, but SafetyNet is just a flawed system in general. Even on GrapheneOS, with the proprietary Google services running in a sandbox, only SafetyNet basic integrity can be achieved, because the OS needs to specifically be whitelisted by Google order to get full integrity. It‘s a ridiculous monopolistic move by Google. I just never use banking apps on my phone, I have a dedicated small and light laptop only for banking, that I can also take on a trip if I need to do anything related to banking on the go. I do this for extra security, so my banking is separated from all my other digital activities, but I‘ve heard that basic SafetyNet integrity that be achieved on GrapheneOS is enough for many banking apps.