A better question yet is how you have got to Active Level 7 by asking a whole bunch of questions that no one here can answer and even if they try to answer you ask more stupid questions
Bixby is the Samsung intelligence assistant first introduced on the Galaxy S8 and S8+. You can interact with Bixby using your voice, text, or taps. It's deeply integrated into the phone, meaning that Bixby is able to carry out a lot of the tasks you do on your phone. For this reason, access to contacts is necessary for Bixby app.
All the permissions are using to make the app function correctly. The app will not ask to use certain permission (i.e. the camera, Contacts, Location, Microphone etc...) until you have begun using the correlated function (i.e. taking a picture, accessing the files or numbers etc...).