Means of production more has to do with scale. Software is extremely unique as an industry in that people can truly "produce" something by themselves - all other cases of self-employment I can think of are pretty much services, which is a whole other can of worms. A tech oriented example of a means of production that Marx would want run by the state would include any cloud service or datacenter. The average person simply can't afford to start one "on their own" without outside capital.