This is nothing more than a research tool. I don't see how many neurons it has, but I'm pretty sure they're only talking about dozens. For reference, the simplest central nervous systems in the wild have about 100 neurons while the human brain has about 86 billion.
A huge downside any system like this has vs. one that's purely digital is that you can't just load up a neural net model and go. Each one of these has to be trained, before you can use it, and the training will vary and just might not succeed. At that point, presumably you'd throw out the brain chip and get a new one and that's presumably not cheap.
Not to mention that living cells are a dynamic thing. For instance, I wouldn't be surprised if performance varied from day to day and maybe even declined over time, before they eventually die.
BTW, do you need to give them breaks so they can "sleep"? As far as I know, all organisms with neurons require sleep.