No nothing like that. dMania won't vote anything without your permission.
SteemConnect is a tool so that users can securely login on other apps on Steem. It's used by many apps on Steem like Dtube, busy or utopian.
If you have every any doubts you can revoke the posting permissions from dMania on SteemConnect.
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Ahh, I get it, I can upvote posts (memes :) directly on dmania. Thanks!