You can share your content, you have the advantage to share it first since you are the one creating and posting it, others can then also choose to share it in other places on reddit.

As long as they aren't sharing it maliciously (with intents to defame or lie or cause a bad reputation to hive/the author), we can't enforce people to remember each and every author that doesn't want their content shared.

You can however ask them not to share it, but it's not something we can enforce or get in the way of.