Fair point about those existing DNA databases, however I still think there is a sigbificant difference between “opt-in” databases, like MyHeritage, and the FP/F

Fair point about those existing DNA databases, however I still think there is a sigbificant difference between “opt-in” databases, like MyHeritage, and the FP/FI databases in scope here (the OP) where its law mandated registration in case of travel (Schengen) or asylum, visa etc. There are a lot of the latter, and its not exactly opt-in or delete on request