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EOS is the biggest threat in my opinion, it looks like it will be an even more impressive blockchain than STEEM

That’s why I own EOS!

Does it have built in reward system for creators, developers and contributors?

I'm pretty sure that the apps built on top of it will be able to do all those things and more

Probably. But they'll just be even bigger. I don't see anyone damaging steem's quasi-donation model niche, and we are nowhere near the maximum for that niche.

It's just a matter of time.