According to Graphene OS, the Compatibility Test Suite and Compatibility Definition Document requirements Google says are key to Play Integrity compliance are in practice routinely ignored, and the system easily bypassed.
Just wanted to say, I use a custom ROM with software on it to circumvent the Play integrity stuff.
Oh no, my device is insecure, there could be malware on it. But people use Windows PCs to access their banking website. I'm sure there can't be any malware on PCs!