@digepix  You'll be fine. Either way (for Tidal and for Amazon) you will be limited to CD resolution. Share your findings if you sign up.
Here is the link:

https://www.amazon.com/music/unlimited/hd

Please note I'm not affiliated with Amazon. I also don't plan on signing up at present. I'm a happy Tidal and Qobuz via Roon streamer. : )
Usually I'm not too thrilled about Amazon taking over markets, brick and mortar, etc.  And I'm no expert on the economics of this.  That disclaimer aside, it does seem like it will put market pressure on all to stream higher resolution and that is a good thing for the hobby. 

Off to check out the terms.