I would say that you can make it sound like an interesting question in terms of precise wording and definitions of things, but practically it is an absolut obvious, trivial question where basically almost 100% of people would inter-subjectively give the same answer (except when they have an egoistic motivation to argue against the obvious)But, to go back to the poker example, if I lay my cards out on the table, can I then tell people not to look? If I am sharing my hand on social media in real time, can I claim due diligence for keeping my hand secret?
I think the answer is "no" to the first idea and "yes" to the second, and that stream sniping is cheating. But I don't think it is a foolish question.
The only questionable scenario would be when players would need to actively put effort to avoid cheating. Like, when I join your Discord channel and give you informations, would you need to kick me immediately and what do you do with the informations? Happens with backseat gamers who give infos in the chat sometimes, players struggle because,using the information is kinda cheating but actively not using the information is also weird sometimes.
But as long as you still have to actively search for the informations and you do that on purpose, it's a very obvious case.