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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.
and does that word mean anything in this context?
No. Nothing reddit is doing is illegal. When you sign up for a service like reddit, there is a TOS, which allows them to ban, warn, limit interaction, etc, at their discretion when terms of their TOS are violated.
If their TOS doesn't allow pictures of butterflies, and you post pictures of butterflies, you will receive a warning. Continue posting butterflies, you'll get banned, until eventually receiving a permaban. There is absolutely nothing illegal about it, because their TOS specifically states no butterfly pictures.