I launched ClosingBell (http://closingbell.co/download) 2 years ago to help retail stock traders collaborate and share investing ideas. Never raised. Never got press. Never had a team to help. But I managed to grow it to 14,600 members, and over 1,170 have connected their Robinhood brokerage account via a partnership with them earlier this year. I launched a freemium model in May that now does ~500/mo. I never marketed it as I am still experimenting with the business model. I have tried growth hacking tactics in the past. I recently made a Slack app to raise awareness: http://closingbell.co/slack