I have shared drafts in the past with people that will see their Discord messages in screenshots. Never had an issue.

Also I don't put the messages out of context. They can also click the link and see the rest of the conversation to get the context if necessary.

Finally, all screenshots are public comments. It's like taking screenshots of Tweets or Reddit comments, I think. Having said that, if someone requests I remove a screenshot of their public comments, I will do it.