What about things explicitly designed in a way that there is no option to be forgotten. What about commits in version control sites? What about mailing lists?

What about things explicitly designed in a way that there is no option to be forgotten. What about commits in version control sites? What about mailing lists? From skimming over the spec, it seems that politicians haven't thought about any other sites than social networks or some other profit making sites. Even in that case, if some ML system is trained on the data of the customer, do they have to re-train after anyone invokes right to be forgotten.