Simply put, many (probably most) of them didn't escape that fate. After the Time War, as revealed in Series 1, there were very few Dalek survivors: the lone Dalek (in "Dalek") & the Emperor with a handful of followers (in "The Parting of the Ways"). Almost all of the Daleks in "The Parting..." had been created by the Emperor & his attendants out of human genetic material.

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