I'll gladly upload my stuff into some repo they allow me to. I've inquired about it in the past - I wrote a piece of sw that fills a requirement hole left by a widely used SCADA tool - but they outright forbid it. That was about a year ago.
My point is less about open source and more about how they have no clue how to handle their IP even now. It's a nice gesture at best (at least currently. Maybe there's more on the way).
At least for ASTRA, for software developed in their projects that's already the case. Frameworks etc. used are not covered, but all source code for PLC and SCADA are theirs and you're required to hand over all code as part of documentation at the end. As a zip on a USB key, never to be looked at again.