There would be no other incentive for companies to buy it.
A company might want to extend it's service offering with a build pipeline/CICD system, and buying GitLab would get them the best-in-class service.
Microsoft bought GitHub for much of the same reasons, and GitHub didn't went to hell after the acquisition.
What point do you think you're making? I mean, do you think anyone looks at a PR and says "this PR is clearly wrong, but it's so consistent that I must approve it." That's obviously not the point, is it?