Your main point is still valid but Steam still takes 30% on the first $10 million in sales [0]. If you're an indie, this is almost certainly not going to apply to you [1].

There are a few new options for game marketplaces such as itch.io, the discord store, and the epic games store. All of them take a lower cut than steam. However, so far none of the steam alternatives have a large number of popular games.

[0] https://www.rockpapershotgun.com/2018/12/01/steam-taking-sma... [1] https://www.youtube.com/watch?v=WycVOCbeKqQ