A court in Madrid heard it was assumed the message triggered alarm bells after being picked up via Gatwick’s Wi-Fi network.
Public wifi without a VPN is like sex without a condom. The connection may not be encrypted (very risky) and even if it is, you are still susceptible to man-in-the-middle attacks: garlandtechnology.com/…/how-to-monitor-encrypted-…
I guarantee there will be a flood of articles about this over the next few days because of what I quoted above.
It’s also possible that one of his “friends” reported him or something like that.