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The purpose is to reward to users. Without any token, how would anyone be rewarded on these platforms?

20 platforms, 20 tokens.
Not my vision...

I see that it's different than steemit, but steemit wants to do communities too, so then?
And what if steemit moves to EOS based platform?

All these things take time, resources and engineers to manage; security issues are a HUGE ISSUE: best to move to a single platform that provides all needs to various applications. Just like iPhone, just like Android, etc.