It is certainly not open source, but it is a copy left license.
You could make the exact same argument for literally any open source project where someone forks it.
The “power” of open source is that in theory if the creator went rogue that the public can switch to the fork as the main app used.
I really fail to see if the dataset is open, how the data itself (of course not the web domain or front end) would be any different in a fully open source project. Maybe the transfer to a new app in the last case would be quicker, but that is about it. The dataset is the gold here.










But python is more of a first class citizen in libreCalc.
You can use Numpy, Pandas, matplotlib, etc… In both excel and librecalc since recently and excel has a hacky runtime inside of it that often has to be restarted if leaving it idle for too long.
You can do 10x what you can do in excel + VBS with python packages. Dataframes alone for data analysis is night and day compared to VBS hacks.