With MicroCash it will be possible to do a variety of non money based activities even though it is only optimized for basic money to money transfers. One of these is linking accounts together to form a data stream. An account in MicroCash allows the owner of that account to store a small amount of data which will likely be around 128 or 256 bytes. Not much when it comes to file storage. But by linking an account to another you can then put as much data as you want into MicroCash.
You may be thinking that this opens up a potential denial of service attack as someone could store the contents of wikipedia in there and make running a node so costly that no one will want to do it. However each account has a fixed daily cost which means unless the owner really wants to pay to keep that data there it will decay over time.
One thing that some people will want to use MicroCash for is to store their web files. This would then allow anyone running a MicroCash node to read a website and have zero trace of them actually ever reading that website. If you are familiar with TOR you will know it roughly tries to do the same thing by allowing users to anonymous read and interact with websites. However TOR whilst fairly good at doing this does have some disadvantages such as leaking information to exit nodes. Some also suspect TOR is traceable (at least to some extent) and point to cases like the Silk Road owner getting busted not long after some weird TOR activity happened. Either way in MicroCash you will be able to read a website and have 100% faith no one knows you are doing it.
It isn’t all roses though as actually interacting with a MicroCash based website will be much more costly and harder to do than is available in TOR, but still theoretically possible and pretty anonymous. But for many people that run such “grey businesses” all they basically need is a way to let customers place orders which MicroCash easily allows them to do. Well it be a WEB 3.0 experience? Probably not, but at least giving those grey markets a way to actually operate within MicroCash will add to its use case.