[ithkuil]

weird, I just clicked on a download link and downloaded the browser; they never asked for my email

EDIT: ah ok, they ask for an account after you have downloaded 300MB of junk.

[dekatron]

I think they show different buttons depending on your platform. If you visit from a mobile browser, it shows a "Get download link" button which asks for your email.

They presumably do this so that people can download it later from desktop using the emailed link. It's easy to mistake it as an attempt to harvest email IDs. The website could definitely use some text which indicates that it's Mac only at the moment.

[underlines]

Binaries aren't available for Windows. They show a "Join Windows waitlist" button that leads to an Email form.