What would it mean for a PaaS to be open source? Does it mean you have to deploy it yourself on your own hardware/cloud? That seems like it would obviate the b

What would it mean for a PaaS to be open source? Does it mean you have to deploy it yourself on your own hardware/cloud? That seems like it would obviate the benefits of PaaS where someone else is taking care of running everything underneath it for you, and you just have to worry about your own application code.