Hi masukomi.
Currently it's still a side project (started a few days). My plan included the following phases:
1. Idea + POC (solved technical issues) => Done
2. Build a MVP => Done
3. Get some feedback and see if there is any interest. => Here we are!
4. Based on feedback, add (premium) features but keep the basic service for free.
So in summary; yes it will stay free, I might add some "acceptable" limitations but the goal is indeed to propose additional (non-free) features like well-known services (for instance Gitlab).So feel free to share your ideas, I would enjoy to answer and challenge them!
Furthermore I plan to write a small survey to get more feedback.
About the "Open Source" part: as a regular FOSS contributor, I do not exclude to publish sources. However, publishing sources means maintaining them. And I don't want to maintain a useless project. So currently I don't want to publish them.
Hope it helps you to understand my strategy for this new experience!