That's about 5 - 10 times the amount of unlocks I do. Not what I'd consider minimal, at all. :D
Continuously streaming video? Not at all, might watch something here or there but most of my device usage is text or just reading. I barely use the phone or texting or social media.
I think we forget just how data-hungry modern apps are. A 1080p "Full-HD" YouTube video will consume 4GB/hour of watch time. Even going down to 480p is still 1GB/hour.
True. I really try to avoid using the browser for anything unless I'm on WiFi because a single page (really all the other crap that gets loaded besides the actual content that I'm looking for, even with uBlock Origin) might eat dozens of MB. For a while I used the NPR One app to stream podcasts, but I gave it up when it started using way, way more data than streaming audio should ever require.
I'm admittedly a minimal user of my phone. I average about 10 unlocks per day. Especially when I'm on-the-go, it's just calls and text messages, some driving directions, and maybe looking up a phone number or business hours. If I use it to listen to an audiobook or podcast, I download those ahead of time on WiFi. Using only 200 MB per month is normal.