Hacker News on 19 April 2019

• Ask HN: One-person SaaS apps that are profitable?
• Its butterfly keyboard design has failed, but Apple has yet to admit its mistake
• Applied Category Theory
• Austrian government seeks to eliminate internet anonymity, with severe penalties
• 26 States Now Ban or Restrict Community Broadband
• Refused U.S. visa eight times, Zoom CEO is now a billionaire
• Ikonate – fully customisable and accessible vector icons
• Types will be part of Ruby 3 stdlib source
• Micro-promotions and mentorship: impact of small actions in engineering culture
• How to register a company in the USA: the most comprehensive guide for founders