Why not? You have no idea what is going to happen with the current flavor of the month. It might disappear next month or go on for years and years.
How do you know today what services will still be around in 10 years?
Really the best option is to avoid them all entirely and stick to real purchases where you are in complete control of the product you've bought.
My oldest MP3s predate ALL music services.
My oldest MKVs predate ALL video services.
I suspect that I will still be able to use my media horde long after the current flavors of the month are long gone.