I hate to say it but fyi, don't give blood nowdays unless you read all the fine print they have an opt out policy you trust...
Presumably it's for medical research but that doesn't mean it similarly gets bought/sold for another purpose, sooner or later and possibly in bankruptcy like 23andme as mentioned by the parent poster who cared enough that I figured I'd warn them about less intuitive similar risks.
I think I have started to see similar language at doctors office paperwork recently but maybe I am misremembering. If you care about not getting sequenced, you have to read the fine print nowdays.