I work at NanoVMs. We don't actually do hosting. What we've found in the past is most organizations are very wedded to their existing infrastructure (AWS/GCP/Azure, etc.) so you can deploy Nanos to any cloud. I suppose we could turn something on again in the future if we wanted too but all of our users/customers are mostly on the big three clouds.
However, you are spot on that deploying Nanos to say GCP is very much a heroku like experience. I'd encourage anyone who is interested to just try it out.