One use case I know of is in a mining operation. They collect a ton of data about their equipment and their mines as they work, but they are often out in very desolate areas with no internet.

The mining equipment runs greengrass right on the machine to do real time inference to help make mining more efficient as well as flag potential equipment failure to the operator.

So they would strap this device onto the equipment, it would collect data and do inference, and then they can swap it out for a new one and send the old one back so the data can be added to their data lake to update all of the AI models.