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But on Steemit, we have an option to not vote for such AI.

But how would you know? Would you be like "this is way too perfect, must be fake"?

Yeah you’re right. But yes, some whales do look for “introduction posts” to check if you are a real user. Thise whales may not vote for an AI who, of course, wouldn’t be able to make an introduction post.

I feel that anyone with that intent could easily pay a human to pose for the introduction post and then run the bot as intended in later posts.