In the US, GE makes your microwave, aircraft engines, and also the gas turbine your power plant uses.
Siemens makes appliances, MRI machines, and even nuclear reactors I believe.
Or in Korea: Samsung, Hyundai, LG. Samsung makes chips, TVs, washing machines.
Japan: Mistubishi makes washing machines and excavators and mining equipment.
India: Reliance has cell phone service, grocery stores, and oil rigs. Tata makes cars, has tier 1 datacenters, and runs hotels too.
This is hardly a novel idea.
The only recent exception is Samsung because of memory suddenly costing 10x.
For a while, didn't Amazon do the same? They basically ran a loss with Amazon retail but profits on AWS, until they spun off?
So yes, this is fairly common with conglomerates, (Amazon sold diapers at a loss to put diapers.com out of business). And in fact, this tactic is a target for anti-trust laws where they exist.
Until they sold all their compute to anthropic, Ai was the boat anchor.
No way in hell is Twitter making a lick of profit.