A simpler definition could be how a content is meant to be spread; whether it is "broadcast" vs. "multicast/unicast".
Like, I cannot think of any legitimate reasons a kid's "performance" needs to be on tiktok. Facebook/whatsapp, maybe, if you're sharing it only with your friends, or even YouTube with linked-only if you want to send the link to grandma. But why would you ever want to publicly post a video of your child for five million+ viewers?