Comment by HomeDeLaPot

Sounds like good advertising! If these companies are trying to sell hardware corresponding to this software, then having a callout right in the software's README is a great way to attract people who are discovering the project through GitHub. This wouldn't work as well if the product was oriented toward non-technical people (not discovering it through GitHub) or if the software wasn't directly related to the hardware (most OSS projects are probably run on general-purpose hardware).