I'm most surprised to see a new application launch without a Windows client. Is this a conscious marketing decision to not target the Windows user market? Is th

I'm most surprised to see a new application launch without a Windows client. Is this a conscious marketing decision to not target the Windows user market? Is the market share of iOS, Android and OSx enough for these guys to succeed without a Windows client? The website notes that a browser client is coming soon, but nothing for native Windows.