.cbw is comic book web files, they don't contain any of the images themselves but is rather just an metadata file with the image urls saved in the text file. This makes them tiny and is perfect for mobile use and other things.
Most urls out there is static, aslong as they are online they should be loadable.
On the Lanraragi side, you would load in the image url directly instead of the image file in the WebUI.
These files can easily be converted later down the line by the user if the files are still online obviously!
This gives the user the ability to have an entire website "stored" in just a gigabyte or two at most while having all the metadata locally and giving the user all the metadata control a client like Lanraragi or ComicRack might support!
In the end it gives the user more control over online files, being able to process metadata from the sites in bulk. Most of the sites i have tested this one has static image urls with CDN's which doesnt have much say in the end. Don't see it being a huge issue in the future.
https://wiki.mobileread.com/wiki/CBW Here is a single example file: Tachibana-san's Circumstances With a Man.zip
Nothing stops Lanraragi and its download system to save comics in a .cbw format either as an online alternative!