Today (UK) if you want to watch most things well it's Netflix (with DNS/IP region hacks to get US and UK content), Amazon Prime Video (probably the poorest of the bunch at least in the UK as here it's nothing more than a VOD service sadly), NowTV (Sky) which seems to grab all the new films and probably a couple of additional players soo to be important.
And this is only if you care about English language content, if you want regional content in Spanish, French, Italian or w/e you probably need to find a couple other providers.
So what 2 years ago was a 5.99 all you can stream buffet is turning into the same bloated cable package from 10 years ago, get basic (netflix) and then add all the other stuff. Still need to pirate HBO if you don't have Sky or you want HD, if HBO Go(? or was it live?) launches in Europe that's another 5-10 US/GBP/EUR a month, sheesh...