Large passenger airplanes are almost exclusively built by Airbus and Boeing.
Almost all smartphones use Android or iOS.
For launching a big satellite there are just a handful of options, or sometimes just a single one depending on the satellite. If you want a short trip to space (without going to orbit) there are just Blue Origin and Virgin Galactic – both currently not flying for different reasons, however. If you want to get people to orbit (commercially) then SpaceX is the only option at the moment.
It’s typical for industries where you need to spend billions on infrastructure and development before you can sell anything. The existing companies have all that already, so staying in the industry is far easier (cheaper) than entering it.
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