Interesting Forbes article. The times, they are a changin...
Certainly Spotify has quite a large library of music. I like the software and the paid subscription version quality is good. What differentiates Tidal is that it can stream losslessly (they call it HiFi) and I swear it does sound better. of course it can also stream at 320 or less depending on bandwidth as needed. As far as I can tell, Tidal has an equally vast library but I've only started discovering it.
I also like that it works on most any platform I have (iphone, ipad, computer, android devices) and has the ability to downloaded music for offline playback -- great for traveling which is exactly what I've been doing the last couple days. I've been playing via an iFi Micro iDSD from my iPhone to either car audio, headphones or powered speakers -- have music, will travel. It's pretty awesome.
But, what I like most is that it reinforces the value of lossless music of highest quality. As tmazz suggested - I fear a world where all music is compressed and only available in mp3.
I'm tempted to say that what I don't like is the $20/month, but truthfully, that's not it. I certainly spend more than $240/year to own or gift music in one form or another and will likely continue doing that. I do prefer music ownership to music service. But damn if there aren't times when a good music service is just incredibly useful.
The question... as these services get bigger, better, cheaper -- will there be a time when the value of music ownership, at least in digital form, is of little value? I suspect we'll be seeing a whole lot of competition in this arena. It's an interesting time...