Mozilla CEO donated to rightwing candidates, records show
theguardian.com
theguardian.com
Perhaps it's because we think that FOSS is free like socialism. I think it's more free as in free market. Perhaps it's because those in power have defended certain corporations in anti competitive practices and patents etc - but this is not really a political issue, more like corruption.
I work with open data - and one of the things we see in this field is that proprietary software likes it, a lot. It means that there's loads of great data to run on the software. And free software is used by commercial companies also.