I have 8 of them plus YouTube TV and Prime Video.

Some of it is a function of my household's love of sports, and their fragmentation across the services. Some of its just sheer laziness to pick one and stick with it or rotate the subscriptions.

I don't think I could realistically drop lower than 3 on this list though: Spotify gets used constantly. One TV/Video streaming service. My wife would likely divorce me if I cancelled YouTube Premium.