the linux kernel is developed by engineers from companies that compete everywhere else.
Intel, AMD, NVIDIA, Google, Microsoft, Oracle, Samsung, and many others regularly contribute code to the same project.
the code doesn't go straight to Linus Torvalds. It passes through a maintainer hierarchy, subsystem trees, review cycles, and eventually into the mainline kernel.
for decades, thousands of contributors from competing organizations have been working on the same codebase and shipping releases together.
one of the strongest examples of large-scale engineering cooperation isn't built on everyone agreeing. It's built on shared incentives, public review, and a process that scales.