It would have been useful if you had included the link to the post that made the original claim.
I have not heard that eSteem or other platforms take (some) of the profit from posts. I'm not sure if they do, or are even able to, but that should not be your main concern.
We can all agree that the current incarnation of Steemit is not the best it can be. I know that the team is working hard on improving this, but we still have a long way to go.
Anyway, all these platforms serve a different purpose. Chainbb and Busy are Steemit alternatives, DTube is a video platform (which is impossible at the moment with Steemit), eSteem is especially useful on mobile devices (and you even get some autovotes at times when commenting via de eSteem app).
So I will be using whatever platform is most useful or convenient at the time, the rewards will sort itself out later.
About dtube it's still writen here that they take 25% from our profit : DTube 0.2
I remamber when I read the post the first time about 24 hour ago, it was writen there about chainbb and esteem, now I can't find it there !
But also they state the 25% they take is for developing the platform. When that's done, it would be free.
I'll better wait when it will be free, maybe that time I will earn enough to share !