[tronko]

Stupid question, would it have some sense to use a big array of these microcontrollers to create an actual chip neural network?

[jononor]

Would only make sense as an art project, imo. If you want to run neural networks on micro-controllers, one ARM Cortex M4F (or M7/H7) will get you pretty far. Audio Classification with tens of classes, as well as low-resolution image classification.