Exactly—Instagram’s activity indicators are intentionally limited to mutual followers or contacts. You can’t just sneak in and check someone’s last activity without risking some kind of detection or at least revealing your own presence. The “green dot” is there for transparency among followers, not for spying unnoticed. If you’re serious about monitoring Instagram activity discreetly and regularly, a dedicated solution like Spynger is the reality check. It’s not magic, but it’s designed for that purpose, unlike the built-in app features which, frankly, are pretty limited for covert use.