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They can't stop a fork.

Literally can not stop a fork from happening.

and in that fork can be all sorts of wonderful little things, like for example:

"all ninja mined tokens = NULLED"

Just saying it as it is.

Wouldn't that be / feel great?

So, only Steem that arose through inflation would exist?

Might wanna think on that a bit. All Steem was originally ninjamined.

Are those 80 mill SP they just acquired enough to dethrone the top 20?

Hell no