How many bazaar projects from even 10 years ago are still maintained? Go through GitHub's trending repos from 2015. Most are abandoned. The successes transform - GitLab, Linux, Kubernetes, more Cathedral than Bazaar.
Did BSD defeat Linux? No. Which BSD is even the right one? BSD's biggest success is living on as the foundation of Apple's Cathedral in XNU, and PlayStation's Cathedral in the PS4 and PS5.
Did Linux stay a bazaar vendor? No - 90% of code has been corporate contributed since 2004. Less than 3% of the Linux Foundation budget goes towards kernel development. Linux is a Cathedral, by every definition, and only exists today because Cathedrals invest in it for collective benefit. It's a Cathedral, run as a Cathedral joint venture, to be abandoned if a better thing for the investing Cathedrals ever came along.
GCC? Being clobbered by Clang. Less relevant every year. Same with GNU coreutils, slowly getting killed by uutils.
Firefox? Firefox only still exists because a Cathedral called Google funds it.
LibreOffice, Apache, PHP, Blender? Professional foundations that get very picky about who is allowed to contribute what. They aren't amateurs and they all depend on Cathedral funding. Blender only got good when it started collecting checks from Qualcomm, NVIDIA, AMD, Intel, and Adobe. Blender is a Cathedral funded by Cathedrals.
I really dislike all the corporate involvement in Linux. I don't believe in win-win with commercial. That was the main reason for my choice though there's other things I like too such as full ZFS support and great documentation.
Uhh, all the big ones in common use? GNU’s massive portfolio of software, Linux, multiple BSDs, Apache, Firefox, BusyBox, PHP, Perl, the many lineages of StarOffice, LaTeX, Debian, vim, fish, tmux, I mean this barely scratches the surface. Are you kidding me?
How many startups have failed over the last decade? I would argue that the norm is for any project to eventually cease. Only useful things with an active community (whether that community is for-profit or not) tend to last, until they are no longer valued enough to maintain. This goes for things in the physical world just as it does for software.