I had the same problem. "Share View" button isn't visible in my pro plan. You could prefer to create a list view in interfaces, then you could share by e-mail or invite link.  

I don't know if this will work. I think you have to be logged in to see an interface. 

Agreed. It's a fantastic little tool for hierarchically displaying information...but I can't make it public. Are they worried about making something too good?

With the new interface sharing feature in the beta, people can also view with a public URL without logging in.