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You'd be surprised how many accounts you can find if you search free github repos. People tried to create bots/scripts over the years and left the keys in the scripts. I remember reading about this a few years ago, someone actually made a bot to check for the keys in repos, can't remember who exactly.

Yeah, maybe that's one of the reasons, but he could have another way to hack a Steem wallet. But anyway, always be aware.

Unfortunately, they've been linked to many cases of hacked Steem wallets. I don't know who they are or how they've achieved this, nor a solution.

Yeah it's really difficult to understand, who they are;