Well, there's no "there" there -- we're only allowed to see a video.
Whenever an app allows collaboration, it means a server is running somewhere. Which means someone has to pay for the server, and that your data might be exposed on the cloud. Which means there will likely be a cost for the service. It seems like none of these services offer reasonable prices -- they always jump right in at the $100 per year rate. Never $25 a year. And of course, unless you know your data is encrypted, you have no idea whether it is secure or not. Your data is often stranded on an island, not able to ever get off except slowly, piece by piece. Sometimes "helpful" exports are allowed into obscure formats, like OPML . Try finding an app that understands OPML!
Saving from the web isn't that hard in TW. The hard part is the need to offload images and text to the local hard drive in order to assure performance. I keep hoping that we'll have a convenient way to convert captured work into local files. I think what Saq is doing will help with that, though it requires node.js. A possibility is a plugin tool where you could nominate tiddlers to be part of a zip bundle. Download the bundle. Unzip. Now your bundled objects (images, texts) are stored on the local hard drive. So you could have a work flow where you periodically purge locally captured material onto the hard drive.