You are the owner of the project you have generated. Strapi is under both the MIT and AGPLv3 licenses. These licenses are open-source licenses which allow you to sell the project you have created to your customer.
We are going to add more features in the future. We are open to feedback to improve the set of features and advantages. We already have ideas dedicated for teams in the pipeline (team workflow, deployment, dedicated support).
If your project is using paid plugins, you will be able to buy them and leave the recurring plan. Please contact us if needed.
Currently the Premium plan is compatible with an infinite number of projects and we are not limiting the number of users whom are allowed to use the same plan. It is likely to change in the future.
No, the community edition can be updated as you wish. The Premium plan automates long manual tasks and also prevents from creating bugs when running migrations processes.
As a Premium member, you get access to a complete support offer. It means that it includes technical and functional support on the entire ecosystem (plugins included).