Most apps are published to both iTunes and Google Play. Most songs to Goole Music, Spotify, Apple Music and probably a few others.

As long as it's within 10yrs old, even most games are available for purchase, anywhere in the world, from the different platforms. While the majority is exclusive to Steam, other providers have their own niche markets.

When I make an IP, I want to capture as much of the market as possible, anything else is throwing money away.

The anti-trust comes from the environment where three or four media companies own all of the production and redistribution and each one believes that they can become a monopoly and get all of the money.