If you can't see why a car purchase isn't a comparable scenario, I can only assume you're deliberately misunderstanding or misrepresenting the argument and i'm not interested in engaging with wilfully dishonest argument.
I totally agree with you.
I'm not sure about everyone else.
But for me personally....
If Netflix has enough good content I will Subscribe to them.
If amazon has enough I'd also subscribe to them.. Concurrently.
If they both have loads of content I'll subscribe to both perpetually and concurrently.
If both have limited content I will subscribe say 6 months of the year to both.
If Netflix only existed. And no other service but it didn't have enough good content I would still only subscribe say 6 months.
In this way I don't agree its like a supermarket. I have to use a supermarket. Food is an essential. If there is only 1 they can charge the earth.
Even if Netflix is the only service. It cannot charge 100 a month. Because it isn't essential or even necessary to life.
Netflix, even on its own has to produce good content at a decent price. Because the option of no streaming service is an option.