This tool used to be open (AGPLv3 for some reason; it’s not a network service) and they changed to this crap license once they realized they had something good.
Realization for the license change was a bit different. From day 1 we knew Tart is good and hoped to build a healthy ecosystem around it. Unfortunately, our enthusiasm wasn't met by big companies. You can check this blog post for more details https://tart.run/blog/2023/02/11/changing-tart-license/.
The free usage is pretty generous: free on any amount of personal computers including personal workstations and up to 100 cores (12 Mac Minis) when installed on servers. If your organizations needs a bigger installation then it's probably values the product and can budget out a little bit to support it.
