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This. Indie developers opt-in to Steam's 30% cut because they've done the math and found thay it's better than going at it alone.

If iOS developers had a choice, many would find that Apple simoly does not do enough for them to justify their cut.

The same thing is happening with Google, except you DO have the option to bypass Google play if you have enough muscle, which is exactly what Fortnite did.

One argument I often hear is that "Becsuse they created the platform! They deserve to tax it!". This presumes that platform is doing software a great service. Funnily, just a generation ago, Mac was widely considered the losing horse because "all the software is on Windows." So the question of "who needs who more badly" was reversed.