As I mentioned, I looked into Amazon Prime as well, and using that way to view had problems: Since I had already easily set up a CuriosityStream account, it was apparent that the Amazon link did not have much to offer in variety -- it was a truncated list of videos. Basically, Amazon shows you what they want you to see, and they want to start charging you more money and do so immediately. No free trial for a month or two. Once I compared the two services, I called Amazon to immediately cancel the service since I could not figure out how to delete the app myself.
When I had added CS to my Roku list of Channels, it worked immediately, I was inside my complete CS account,(looked and worked like it did on the iPad) and of course, there was no charge for adding the app to my Roku. There are significantly better app experiences with Roku than through a Fire TV and easier operation.
Actually, I first learned about CS while looking for an obscure BBC video at Amazon Prime. When I found the video, like many there at Amazon, it asked "how do I watch this video?" and it said if I had a CS account I could. So, I decided to find out via Google who CS was, and that's how and when I decided to sign up with CS and not with Amazon at the get-go.
Now, for the content variety comment: CS has a lot today, and just as importantly, specific content is easy to find. They also redesigned the GUi of the site recently and added the ability to cast to a Chromecast so, no Roku is needed now to get video onto the big screen.
As for this comment: >> when there is a referral link, it is spam!!!!
BS, not when a message/link is given to you by someone you know, he is not selling anything, and there are not any possible viruses in an email. For the most part spam, comes as email from unknown entities and could even be dangerous.
So, let the others who read this thread about CS decide if they want the free offer and let THEM decide if this service would be worth paying for AFTER they have used it for free for two months. Heck, I might even not stay with it "forever". Time will tell.