I think it's a silent market at this point. The company I'm at is using it, and anecdotally, many other companies are as well in small greenfield projects, so I anticipate there will be growing demand for developers that know rust in coming years. The downside of this is that there will be a massive influx of people learning rust, similar to "the python problem". At the moment, most people that know rust are for the most part competent with it, but I fear that may change as the supply side increases.