Will they turn out to be evil,good or something like Shield in the end?

They will probably turn out to be evil but they seems to have a few good intentions.

As far as we know so far, Spyral is made out to be the bad guys and Dick Grayson is infiltrating them to destroy them. Down the line, we might learn more, but as of now they are the bad guys. Hopefully it becomes more complex with that, and not just black and white, good and evil sort of stuff

Spyral used to kill the costumed crowd. It might be that they are just trying to learn who everyone is in case they might need to take them down, if they go crazy. That would be interesting.

Evil; or perhaps there'll be a split within the organization. It would be nice for them to survive on after this story and stick around.

Evil, organizations like this always turn out to be evil