Well the founders are kinda of stupid to choose 'Do' as their company name, showing zero awareness of SEO. Maybe it is not far in the future, until The startup emerges...!
From their shutdown blog post [0], it looks like they gave users just 9 days warning before they deleted all user data. Also, the login link (still present in the header) takes you to a page they seem to have forgotten to add content to [1].