From my experience, most FOSS software is very user friendly user-centric / user-focused, while proprietary stuff is shit. What is the most notable exception to this rule that comes to your mind?
Edit: With user friendliness, I don’t mean UI design, but things like how the software is handling user privacy, whether it sees its users as users or as money-making cattle, how it handles user feedback, compatibility with other software the user uses (vs. vendor lock-in), configurability, and similar issues.
Edit2: I was made aware that user friendliness is a defined term: https://en.wikipedia.org/w/index.php?title=Userfriendliness
Steam doesn’t fit OP’s criteria. They definitely prioritise profit over the user’s preference.
When you open the app you’re immediately shown pop-up ads ffs. And the app opens to the store.
You can disable the pop-ups in settings and default to opening your library by default but it’s difficult to locate the relevant settings.
Steam transformed the PC gaming experience for the better but I find people’s reverence of it is misplaced.