I certainly think this should happen.
The trillion dollar giants should not span multiple industries. They have absurd monopoly power and can make growing your own niche impossible.
Why does a cloud computing / operating system vendor / hardware manufacturer / business software / developer tooling company also own the third biggest gaming outfit?
Why, for that matter, are Amazon and Apple also movie studios (and soon to be game studios)?
This is ridiculous. These companies never have to compete with you. It's easy for them to funnel money into any effort and clone your product. You can struggle to grow revenue and they can simply allocate an engineering team and marketing budget.
You'll probably also have to buy your competitor's products or pay their taxes at some point.