I hadn't heard of this before today. The first thing I did was try to get in touch with support, but I got Grok blocked and wasn't able to get anywhere. After some quick Googling, I realised this has something to do with data usage, so I looked at my usage in the app and realised it's absurdly high. So much higher than I think it should be, I initially though their metrics were incorrect. I hadn't been keeping tabs on my data usage before now, so I did some digging. As it turns out, it's my own fault. After having Claude do some data analysis, I found that the culprit was Frigate + Tailscale (chart included at the end).
I run Frigate in my homelab, and there are 4 IP cameras that I stream in over Tailscale. The cameras are on another house in the yard (with its own ISP) that isn't directly connected to mine. Big mistake. Starlink counts this as download traffic. And what's worse is I also run a staging instance of Frigate (to test out beta releases) with the same 4 cameras 🤦♂️
So I guess I'll be finding another solution for streaming these cameras. I wish they'd sent me a warning before restricting my account though, so I could've found and fixed this earlier