What I don’t understand is why governments don’t try to fund open source software.

Cyber is increasingly becoming an attack vector on key infrastructure and it would be so helpful to have a group of developers to be at government disposal while understanding what software is being run on.

I understand that China and a few other countries use Linux but this is not enough. https://en.wikipedia.org/wiki/List_of_Linux_adopters

Honestly any nation not named the United States should move to FOSS if they care about security. Imagine the keys to all important infrastructure being held by foreign companies.

Different context, but still relevant.