All work created on eSteem and Busy also appear on Steemit so it's not that.
More likely it's the quality and more importantly the quantity. Posts seem to be getting shorter as people are doing the minimum to claim rewards.

Typically, Google favors indexing of pages with at least 300 words.

Just checkout the 'NEW' tab to see what I mean -
https://steemit.com/life/@tornadoman/a-storm-is-coming
https://steemit.com/basicincome/@rushofwaves/universal-basic-income-swift
https://steemit.com/busy/@mahfuzzaman/essentially-let-it-out

Quality writers don't get rewarded, and eventually leave, but the bottom feeders are happy to claim a few dollars here and there.