I considered this when I sent them my sample. For me the benefit outweighed the risk. I'm sure their DNA database have been sold or given to all kind of companies and agencies since then (many years ago). Asking them to delete my record now is pointless. Anyone who cared about it already has it.
Not sure you are right. 23andMe may exclusively share/sell summarized GWAS data rather than individual level data. That is how genetic data is usually shared even among human geneticists.
