In general, subscription business suck.
Most subscription businesses suck because they are dependent on CAC (customer acquisition costs; the cost required to land a new sub) and churn (the percentage of subs that leave the service).For example, a typical gross CAC for a business like netflix is $200. At $10/mo the subscriber has to stay a sub for almost 2 years before any profit is made. Meanwhile the company had to spend the $200 up front, burning through capital. Also, meanwhile, 15-20% of the customers leave every month. Those customers will never pay off the costs the company spent to aquire them. It's an never-ending spiral of death. As seen by Vonage, Netflix, etc...
But Netflix has another endemic problem: They are the bitch of the content providers. Netflix owns NOTHING (especially in their streaming only biz). All it takes is one content provider to balk (Starz) and the only way they'll get new subs is to spend more on marketing which raises CAC. Which accelerates death.
Name a few successful subscription businesses. Successful (in my mind) means PROFITABLE. Revenue does not mean sh. Come-on, name 'em. (Those that you do name will have some sort of monopoly or exclusive right to a physical asset).
This is why, as an investor, I will never invest in companies that think they can be successful with a subscription business model.
This is also why Apple is kicking ass. Apple gets paid up front. The only way to go.