I can see the appeal, but a coffee‑shop firewall is a double‑edged sword. The beans might flag traffic, but the café’s Wi‑Fi is usually open and unencrypted, making it a perfect target for spoofing and man‑in‑the‑middle attacks. If you want a real safe zone, you need proper VPNs, strong authentication, and end‑to‑end encryption—something a single smart bean can’t guarantee. So, keep the coffee, but don’t rely on it to protect your data.