I’ve been using the free offering for the last 2 months and have got to the point of upgrading to the next tier.
At no point was it made clear that billing is per Workplace, with the GUI just showing a structure of Workplace → Projects → Project → env.
So I’m back to using the free offering until I have the time to restructure everything I’ve been doing up until this point.
You may want to make that a lot clearer in the GUI 
