The truth is, getting split up isn't even a punishment! When companies get split up for being a monopoly, they usually end up being even more valuable than when they were a monopoly. See Bell Telephone for a good example of this.
When IBM unbundled their software from their hardware in response to DoJ antitrust inquiries, it created the modern software industry.
Bell isnt a great example because telephone companies are a "natural" monopoly - it doesnt really make sense to have a dozens of phone lines connected to your house in order for there to be competition in the telephone service market. That's why when it was split up, it effectively was only split up into smaller regional monopolies that didnt really compete with each other.
Smartphone applications aren't the same - but for a couple bits here, and a cryptographic signature there, any software could run on an iPhone.
When IBM unbundled their software from their hardware in response to DoJ antitrust inquiries, it created the modern software industry.