Content writers : Those who create quality content on a regular basis
Contributors : those who engage with the content writers by commenting or upvoting
Developers : Developers who built the system
Third party service providers : There are alot of service providers who have built tools on top of steem platform or integrate into steem platform to add value to the steem platform. this may include bidding bots, delegation services, data based services, etc.
Investors : investors also play a major role in steem. they are the reason price gets higher and all mentioned above get reward for their services.
