These are basically different markets that only compete with each other because there are finite hours in the day to engage with media, not because they’re offering variations on the same thing.
It’s similar to comparing Netflix to the Criterion Streaming platform. Technically you’re doing the same thing, sitting on the couch watching a big screen, but the experience being pitched is a totally different one and the target customer doesn’t really overlap.
I was thinking more about competition with suppliers than consumers.
If you are a games studio and have resources for three projects this year, do your investors want to see a phone, PC, or console game?
They compete for finite dollars, too.
There was a time when regular families had desktop computers at home. The marketing was intense, the machines were expensive, and the sales numbers were real. The PC was the gateway to all of the spoils of the internet and things were booming.
Now families tend to have a collection expensive personal pocket supercomputers, instead. It's hard to justify the cost of a properly-stodgy computer when everything is online and the machines that everyone already has in their pockets are Good Enough to get things done (including entertainment).