Sorry but either your English is not good, either you still don't understand my question.
I asked: when user makes an purchase and creates account, why there is no mechanism that checks if user is owner of the provided e-mail address? Despite of problems coming from user made mistake in the e-mail, additional problem is that some bots can make hundreds of fake accounts, or someone can use other person data to create a purchase.
Also explain me please what this sentence means: "Furthermore, websites usually request an email address for an email address and update the status of their order."