Just deleted my data. Who knows who will own it after this?
The "regulatory obligations" sounds like a fake excuse. Is 23andme even regulated beyond how your regular average business might be?
They have to retain data about the person who requested the deletion which seems eminently reasonable. In the future if you sue them because you can't access your account that you paid for, they have a record that you requested said account's deletion.
Similarly they obviously can't withdraw your data from the anonymized research projects they pursued.