Yes, and if it becomes really big, then every federated instance would find itself coping with large amounts of traffic passed to and from the big instances, and it will become difficult to run a small operation cheaply. At that point, only the big players with big money will be able to run sites in the Fediverse and it could end up mirroring what has happened to the rest of the internet.
On balance I think it's best if existing Fediverse instances don't federate with the big corporations. But there are still other ways the corporations could sabotage this place, so the developers and the site admins need to be ready.