I recommend you only send your genetic data to companies if you're willing to have it exposed. Then again I also recommend you make your genetic data public, for the common good. Here's Mine: https://www.openhumans.org/member/iandanforth/
DEF CON 25 - John Sotos - Genetic Diseases to Guide Digital Hacks of the Human Genome (2017): https://www.youtube.com/watch?v=HKQDSgBHPfY
https://en.wikipedia.org/wiki/Nothing_to_hide_argument#Criti...
The only benefit I can imagine* is knowing if I have individual genetic markers for something I should tell my son about.