What cought my attention the first time was the possibility to only pay for what you actually read - something I had been looking for. There are many services out there that offer you to follow and pay for content. On service you pay roughly 10$ per writer and month. Of you follow a couple you like and want to support, the sum quickly becomes substantial - and you need to read alot from them to get value back. Another is a fixed 5$ per month - same there, in you dont read enough it might be expensive for a couple of articles per month. That was when I found PoW, where you pay a small amount for each article. No subscriptions that might be drawing money when you dont use it. I suppose that this could have been built on other chains, cant say how the integration and UX would have been, but ecash and cashtab was a hugh wow-feeling for me - great integration and flow. So I came for the content and the pay-per-article flow, and Will stay because I fell in love with the site, the technology, and ecosystem that made it all possible. Hope to be able to soon read a lot of interesting content here !