@kingcolers
I just ran into the same problem. After using my custom domain the webflow-urls do still work and are not redirected (yourname.webflow.com/pagename).
@kkilat
Yes, you name it.
SEO: possibility of double content
(Google) Analytics: possibility of messed up stats
Webflow-Team, please respond.
My suggestion would probably be to add and enable a redirection-option by default when webflow-users use a custom domain.