@bonkmaykr I think he attends there every year. It's the biggest FOSS convention in Europe as far as I know, but it was always open-source first, free software second. It was originally called OSDEM until Stallman asked them to change it. They always included "ethically questionable" companies like RedHat and Element in the convention.

If this was really a problem for him he would go to actual free software conventions like Libre Planet, but that is hosted in America, the country that he left because he hates it so much, and it's hosted by the evil Richard Stallman.