[pwlb]

First,which DID methods will be successful is a question of time, additional your wallet app could support multiple of these DID methods. Second, DID and the corresponding keys are supposed to be owned by the user or managed by a platform, any indivdual can make the choice whteher he wants convience of managed keys or full privacy under his own control Third, you can have a seperate DID for every service and they issue you an login credential for that particular service.