This was written well after he had done the work for which he is remembered. See https://en.wikipedia.org/wiki/Alexander_Grothendieck#Retirement_into_reclusion

This was written well after he had done the work for which he is remembered. See https://en.wikipedia.org/wiki/Alexander_Grothendieck#Retirement_into_reclusion_and_death https://en.wikipedia.org/wiki/Alexander_Grothendieck#Retirem... . That is, at the time the work was done, it was not his intention to limit copying.