I call BS. The title is incorrect, and the contents are deceptive.

If you visit the gov.uk page from a mobile, you get a suggestion for the app.

If you visit on _desktop_, you get https://www.gov.uk/eta/apply ( reached from https://www.gov.uk/eta ) which offers app and online (browser) options just beneath each other.

Also, the author here isn't looking at the ETA main page, they're looking specifically at the _help page for the app_ which, yes, talks about the app (but tells you that you can apply online if it doesn't work).