Only restricted feature in the Free version is FTP access.
This is just to ensure the stability of the server.
All other features are available, just limits how much storage space each Workspace is limited to, and the number of users per workspace.
Free is limited to 5mb which is enough for most small missions.
The number of projects per Workspace is infinite, and the number of users increases with each paid package.
We have not decided on Ads yet, as even we get annoyed by them, and we don't want to ruin the user's experience.
If it does come to Ads to support the server, then we will aim for small ads that are non-intrusive.