I mean, one of the central goals of communism to abolish ownership of the means of production.
Software used to produce something of value is a resource that in a communist society should not be owned. The only way to achieve this is to let everything be opensource.
So communists clearly like the free software movement, whether inverse is true is a matter for debate.
I'm pretty sure the "Deutsche Bank" hasn't stopped betting on rising global food prices since 2013.