There's a lot of folks in startups who think 100 devs is a large org and can't comprehend the scale at which '100% tests pass' stops being a build blocker. I've migrated from such an org to a late stage startup and 'tests must pass' even if fifty engineers are blocked with their PRs and the release train is fully halted. 'But our pipelines must be green' no they don't, at least not all of them.
When you are working on a software project that has 1,000 active developers checking in code daily and require a stable system build you need lots of compute.