Because every company that has libraries, products, stacks, customers using Linux sooner or later runs into issues in Linux, that they can't wait around for som

Because every company that has libraries, products, stacks, customers using Linux sooner or later runs into issues in Linux, that they can't wait around for someone else to fix. Big orgs have lots of people just working on Linux full time. They start out fixing one small thing, which then needs to be updated, optimized etc etc and then things snowball.