I started https://ipinfo.io as a side project, and eventually transitioned to working on it fulltime by myself for a while. I really enjoyed that time, but as things progressed it was a huge relief to bring in other people to help. Offloading support to people that were better suited to dealing with customer issues, and enjoyed doing that more than me. Then offloading design work to someone who can actually do a good job of design. Then getting help optimizing some DB queries. And before you know it we're a team of 17 globally :) I sometimes fondly remember the times that it was just me working in a coffee shop by myself, they were certainly simpler times. But the business would never have been able to get to the stage its at if I was doing this by myself.