Tolerating a small group of users on a single account is a soft power to keep subscription hopping in check. Rotating subscriptions is so much easier when you don't have to create consensus amongst loved ones. It's a magic brand loyalty machine.
But it seems the industry does not want to learn: don't make it harder to use your service for the honest users. They're worth it to keep happy!
They also didn't pull what XM/Serious do and make it nearly impossible to cancel. 4x 40m phone calls, then all I wanted to do was drop one of 3 radios when I sold a car. After the third call drop after a 40min hold time I cancelled the entire service. If I ever use them again, it will be a disposable single use cc #.
In the end, 2-3 streaming services is all I'm willing to pay for. More than that and if rather pirate just for the usability aspect, let alone the costs.