That would be some pretty terrible PR:
“Billion dollar company X sues open source developer because the shade of blue used in their logo is too similar.
A spokesperson for X said that ‘Although they are releasing this software for free to help the community, we can’t have people being confused about the shade of blue they used.’”
It almost sounds like an Onion article to me.
https://nypost.com/2017/05/20/paypal-sues-pandora-over-simil...
http://designtaxi.com/news/361608/Starbucks-Sues-Bangkok-Cof...
https://www.designweek.co.uk/issues/15-21-january-2018/formu...
https://www.cbsnews.com/news/nike-sues-over-copied-air-jorda...
It’s a little different too since she was actually selling products with her logo on them vs. developing free software, but good point.
Fyi, used to work in branding and trademark disputes were common.