My organization needs to keep our information private, so I always make sure I never check "Everyone" when I share my hosted feature service. But it always bothers me to see the Usage Time Series chart peaking into in the hundreds; are requests unique outside users viewing my content? Is organization-level data somehow viewable to the public? Does anyone have a tip to check for any accidentally publicized layers?
Sort of a paranoid question, but it has bothered me for a while now.
You may want to move your question to another space (not in the GeoNet help space):
If your portal is not available outside of your firewall, then selecting everyone within the sharing would just make it available to anyone within your organizations firewall. I can agree that it would not be best practice unless you want "everyone" to see it.