i haven’t heard of any place on lemmy restricting one’s ability to post based on your vote total, but i’d never encountered it during my many years on reddit, either.

if you get a lot of downvotes, and someone is sorting by “top” or “hot”, your post or comment will be further down the list though, and vice versa for upvotes. (though personally, i almost always sort by “new” on lemmy, or sometimes, “new comments”.)