Where does is the money coming from? I'd like to know what business model the company you work for employs.
Note: while our software is FOSS, we don't publicly publish all of it, though our clients are free to do so.
That sounds like what I used to do with my trade secrets that I semi-publish. Enough detail out that hardworking specialists can build it. I'm curious what you mean by it though. Ive considered a model that sounds similar as I figured companies would be incentivized to keep paying anyway so updates/support have steady quality. Was worried about cloning, though.