Yeah but consider that if something is cheap or free (having Microsoft do it), what is the product? It's a tradeoff, pay for independence or be at the mercy of in this case Microsoft.
(there is probably a third, fourth, fifth option but this is an internet comment section)
Yeah they're awful, I'm just saying making it harder for people to put apps on your OS might actually be a bad move. But sure, they can always scrape the barrel.
But that's also a fee that's trivial for well funded criminal malicious parties shipping harmful trash but too high for serious open source developers shipping free software.
So yes there is.