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No it's not open source and yes we're not using steemconnect. For some projects steemconnect might be a good choice to get user trust. But I really don't like the way their centralizing all user accounts in one platform - that's not really the goal of steem :D
Since steem already has some really good security features for exactly that matter, you can use steemvotes.io with your private posting key. This key only allows us posting and upvoting stuff on your behalf. We can never get access to your funds or change anything in your user profile.

I understand and agree with you.

Just so you're aware, there is phishing with similar links going on right now. Keeping all advertisements out of comments is advised until it's over.

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