What is really the purpose of streaming??

Good comments by @goheelz regarding streaming thru a subscription service and also by way of a home server or drive.

Now I have a question for all those who subscribe to Tidal, Spotify, etc; what happens to the music in your library or playlists when you don't pay your monthly bill, or if you cancel the the service?
Since this type of streaming is interactive, do you lose all your saved tracks?

@jond , you answered my question. I was only referring to the service account. I have a hard drive with wav and aiff files, although they are not networked.

So, streaming from a service is really leasing the music; you never get to own it. Is there any way to transfer a song (file) from the streamer to your hard drive?

@jond , yes I've been reading about Tidal and saw that offline feature. Sounds like a good way to go.

@glennewdick, thanks for answering my questions.
The fact that you don't lose your playlists is a great feature. It's making me think I should stop burning CDs thru my computer.
Previously I didn't think streaming was for me because as I stated earlier, you're only renting the songs. So now I know better.

Didn't mean to hijack the thread, many thanks.

The OP states he likes classic rock which can be found on all the major streaming services. But I listen to mainly Classical, a genre which these services are lacking. So, what's a boy to do?

I'd like to get away from the ripping and downloading process to my Mac, with the USB cable running across the floor to my DAC for playback. 
Primephonic looks good for streaming classical, but to also listen to rock I would need to subscribe to two services.

Does anybody have a solution to my dilemma? I have a large CD collection and ripped files, but so far it doesn't seem like streaming offers what I'm looking for.