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eSteem is not Steemit app, it is using Steem just like Steemit.com or Busy.org or ChainBB, etc. giving you alternative user experience with some unique feature-set for mobile users with mobile app and soon there will be desktop and web wallet apps. eSteem is opensource and community project, by now more than 150 people contributed in its development one way or another... Steemit will have mobile app in Q3 of this year as mentioned in Roadmap 2017.

Thank you for the apps that you have developed for us Steemit users, @good-karma.
Hoping that Steemit Inc will accelerate the roll out of a Steemit app.

Well... is made by one of his witness @good-karma and are in the page of Steemit Tools.

So does the buck for eSteem stop at @good-karma or at Steemit Inc?
Apple takes ownership of iOS.
Google is responsible for unforked Android.

Honestly... i don´t know.