There is no inherent duty to protect someone else's secrets outside specific obligations (e.g. state secrets). Sharing knowledge is not inherently irresponsible, whether or not a bug bounty exists.
You'll have to do better than hide behind the term "responsible" to force people to stop sharing knowledge about something they have bought and own.
You'll have to do better than hide behind the term "responsible" to force people to stop sharing knowledge about something they have bought and own.