Thank you for your quick answer,
I'm working on a production cloud company service so I don't have control on the way libs are installed. I can just ask the people in charge and they reply that they installed it with apt.
in some notebook if I del the os.environ['GDAL_DATA'] at the start it mange to find back the gcs.csv file. Problem is: if I then use a gdal function it's the other way around.
Is there a way to make them both compatible with gdal 3.0.4 as suggested in the README ?