As long as it stays private, it really doesn't matter. Enshitification comes from public stockholdership, venture capital or private equity trying to get insane returns on overpriced assets.
They make 30% of the gross sales on their platform... nobody prints money like Valve does.
For reference, stores refuse Amex because they take 1%-2% more than Visa/Mastercard on gross sales. Steam takes 30% and nobody gives a shit. lol