We've used Gaggle for years (even pre-Google), but I'm told it's pricey. There are a handful of us who receive notifications when there's a serious issue - self-harm, violence, porn. We do let students and parents know it's there, and sometimes it raises false-alarms, but it's caught things built-in tools haven't, and we've been able to intervene and support kids through some really difficult stuff as a result, so the money has been worth it. It works with a combo of AI and human verification, so it saves time on that front. We have it set to monitor all Drive and Gmail content - on for students only. We also use it as our long-term storage.