At the same time, an AI that stays up to date with world events and everything new that happens, would in a way have to be both a compute platform + a search engine combined? (To find and train on "everything new".)

But most wouldn't need such an AI (RAG is usually good enough, right), for example not needed software development.

Maybe for a limited time a hardware company could get a monopoly? Eg Nvidia. But they sell to everyone, don't they, fortunately (except for export restrictions)