Can you even watch that much content? I would expect that you only keep 1-3 subscriptions at the same time, and juggle between the different platforms when you want to watch some exclusive content. Like, Netflix for 1-2 month to watch some exclusives, then you cancel until the next time something seems interesting enough.
I don't want to have to manage it on this level, the metagame kills the experience. I wish movies and tv had compulsory licensing like music, because the pick your music service and they have access to almost everything is much better for consumers.
Somewhat related: it's curious that Netflix are so coy about their catalogue. Without signing in, they refuse to show what they offer in your region. You have to make do with a third-party listing site like JustWatch.com