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"Superstar industries" follow extreme power law distributions, where, due to the low barrier to entry, high ceilings, and limited consumer base (there are only so many hours people can spend on entertainment), the pie isn't growing and new entrants aren't going to be able to carve out much that hasn't already been claimed.
It's not a new thing, the name comes from the music industry which acts the same way. Anybody can record a song and print it on CDs, but the market is already saturated: you have to either really really really stand out like nobody has in decades (An event so rare I couldn't find any examples), or you have to get the support of one of the big players (game studios or music labels) to lend you their resources and audience.