The fact the code is open sourced is much less significant than the fact now the Swiss government will need to negotiate complete ownership of any software they commission.
That’s going to make things more expensive for them, and limit the vendors prepared to work with them.
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.