You nailed it with two main points, Steem is ideal for part timers to add to their income and has good engagement. Most platforms have consumers who need to sign up to do unpaid engagement and unpaid curation. Also for content creators, the entry to making any money is high.
Steem allows for a normal looking class system and i encourage people to try upward mobility from opening up their non-steem wallets or by using steem.
If we took medium facebook twitter instagram reddit and steem and drawed up pyramids of income earning including all forms of engagement, steem would be the only one without millions upon millions of unpaid slaves at the base. No don't get me wrong, its not perfect here, but compared with the other sns / blogging comparing it is like comparing a slave plantation to a medieval serfdom.
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And even the high earners on the other platforms are taking only a small fraction of what the platforms are taking themselves.