What is a Tunnel Interstitial?
Several tunnel services put a warning or reminder page in front of browser visitors on free plans. ngrok and Microsoft dev tunnels describe theirs as anti-phishing measures, because free tunnel hostnames are used to host phishing pages.
The page usually disappears after a visitor clicks through once, when the request sends a specific header, or on a paid plan.
How LayerV Implements This
qURL shows recipients no interstitial: the app’s hostname answers only networks admitted by a link, so there is no open page to abuse, and the link opens the app directly.