> If you sign up twice, won't they match your account and merge the results specifically to avoid this problem?
Not if you sign-up with someone else's identity and pay with a different card. I very much doubt they go to any effort to verify the human the sample came from is the same human who paid and who the results are set to be sent to.
Or you could have a friend buy it then reimburse them. Or buy and swap a few times to see if it affects the results. Would be easier to test the theory if it wasn’t so expensive.
Not if you sign-up with someone else's identity and pay with a different card. I very much doubt they go to any effort to verify the human the sample came from is the same human who paid and who the results are set to be sent to.