Something amazing I saw on Reddit about the use cases of Iota:

"My economic model for connected devices, autonomous or not, is that there is capital cost in designing, deploying and managing them, so there needs to be a return on that investment or the projects are unsustainable.
In a distributed economy, these devices are made with an intent to create value - through data collection, controls or more complex functions. When they provide that value, there needs to be a means of exchange of some currency for that value: that is IoTA.
For example, if I want to gather temperature data from a network of sensors that someone or a group of someones deploy, then either they can broadcast that data for free or charge for, but if they want to get paid then they need a whole infrastructure to support that: that is the IoTA network.
Then when whole ecosystems of different types of devices doing different things is available on a single platform like IoTA then we will get amazing emergent behavior that changes the way we interact with our environment.
IoTA has a chance of being at the center and enabling all that, and its token has a chance of being the medium of exchange for that economy." -u/bitbytesbeyond