The title says it all. Browsed Flathub and saw this fat warning label on the Steam Flatpak. Maybe not the best idea if you want to compete with Canoncial's Snapstore, but hey, what do I know 🤷
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
I love both proprietary software and open source software, and personally I kinda like this warning.
How much of a concern it is for software's code to be proprietary, is probably personal opinion. For this reason, maybe yellow is a bit too much? I think making these errors grayscale might be a good middle ground.