freemium/OSS the core, premium the plugins/enterprise-features is one business model. more attractively is the all code for free model, so those who are able c

freemium/OSS the core, premium the plugins/enterprise-features is one business model. more attractively is the all code for free model, so those who are able can use it for free, and you charge a fee for people who are in need of professional support. a third one is still all code for free, but you can pay for hosted service instead of self-host the code, time is money for many people these days. in all cases, you're building a group of followers with OSS, and you sell the hard-to-grasp or time-is-money-for-some-user domain expertise. how to build your moat as far as competition goes? anyone that is smarter than you could copy all the code and do the same business model, the only thing might be a good license? however these days most OSS license are commercial friendly so I don't know how this works.