we do not share your data with anyone and there are many ways to control the visibility and storage life of your data here.
but the internet is a public space and you should always assume your data could be compromised.
be smart with your password, use tor or a vpn, and use pgp for sensitive communications.
Im more physicist than biologist so I could just be beeing dumb but have no human old people had blood transfusions from young people? Surely if this worked for humans someone would have noticed by now wouldn't they?