Surreptitious DNA collection requires some level of targeted effort: someone must have a prior interest in you specifically, which is unlikely for most persons.

Surreptitious DNA collection requires some level of targeted effort: someone must have a prior interest in you specifically, which is unlikely for most persons. Uploading your DNA to a database exposes you (and your relatives) to all sorts of Birthday-Problem-like mischief from persons and organizations trawling the database. The best defense to the current threat landscape (privacy violations related to insurance, employment, and the law) is to define your genome-related queries as narrowly as possible and type/sequence only those relevant loci/regions.