Take a scenario,
There is a project role "role1" with default users "d_user1" and "d_user2".
"Project-A" has "role1" in their project and they add one more user "a_user1" to that role.
Now, "Project-B" also has "role1" in their project, they added new user "b_user1" to that role and they removed default user "d_user1".
In this case:
1. will the default user deleted from Project-A's role1 also?
2. What will the case if new project wants to get that role?