We don't charge for the use of team spaces if you're storing data in your own service (such as Google Drive). Although we incur some costs for hosting our software, we are able to keep costs low by not storing customer data on our servers...
We suggest that you try out our software using something like Google Drive. This lets you verify that the software will meet your needs. Then, if you need multi-user access to data, we can host your data for you using one of our paid plans. We charge for data hosting because we take the need for data security seriously.