And then one of them becomes dominate after 5 years, and the other(s) fold. It's an inevitable problem. The only way to "break them apart" that would make any sense at all would be to break off distinct divisions, like Search, YouTube, Gmail, Google Cloud, etc. Into separate companies. Then forbidding them to acquire each other, and generally be extremely pessimistic/restrictive if any of them attempt to acquire any company at all.