There is a lot of unwarranted 23andMe hate going on here. Not only do they offer at the end of sign up to delete/remove your genetic sample, you can also inform

There is a lot of unwarranted 23andMe hate going on here. Not only do they offer at the end of sign up to delete/remove your genetic sample, you can also inform them you want to do this at any time. DNA is extremely stable at low temperatures so they can periodically re-assay the sample and give you more information on SNPs they have found important or you can opt-out and just get the one sample.