I sort of get the idea, but the page doesn't really sell me on what differentiates it from the competition other than being serverless.

Why is this better than Tailscale, Cloudflare tunnels, Mullvad or just running a wireguard bash script on a machine somewhere.

Furthermore, because its severless, does that mean it has more latency than a typical VPN? For example, I know that when I connect to a Mullvad server, my traffic is going to be quite a bit slower than what it had been.