okay but you make posts with the expectation they are public. Votes only change a number, and are a way for you to show support/disagreement for something without broadcasting it to everyone.
If you want to broadcast it and make it public you can reply to a comment
And useful to let you know if a post is actually genuine/useful, or something you should probably ignore and disregard because everyone else that read it before you discarded it as bad
no it must only be for content farming