Some apps require you to get contact list data. It would be great to have a mock/fake contact list to provide to such apps, so you don’t disclose your real contact list to some apps!
for the mean time, you can create a “work” profile for the contacts app. Your real contacts would be in the work profile while the default contacts app has nothing or even fake people.
Should you be rooted: XPL-EX (successor of XPrivacyLua) can do exactly that (pro version of XPrivacyLua works in its successor). Without pro you can block contact-access your any app, pro can give a fake list.