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Reddit will warn users who repeatedly upvote banned content
(www.theverge.com)
This is a most excellent place for technology news and articles.
I don’t think i ever came across cross posted content where up/down voting was not allowed 🤔
If you cross-post, that sub gets it's own up/downvote count. You would have to open the link and go to the original post to see and affect them, so it already discourages brigading.
NP is when I link you directly to somewhere, e.g https://np.reddit.com/r/comics/comments/1j4scuu/barbie_doll/ won't have voting even if you are logged in, not on the post or the comments.