I worked in IT for years and lean towards the cautious side (have the tin hat to prove it) before giving out any info and especially DNA.
This is suggested reading
https://gizmodo.com/what-dna-testing...ies-1819158337
According to the article, for those who allow their DNA for research purposes...
Essentially, you are buying a test from genetic testing firms so that they can then make more money by selling your DNA for research purposes. The hope is that important discoveries—say, a gene responsible for Alzheimers—come from all this information. But if your DNA is the golden ticket, all of the companies have terms that say you get zip.
My worry is that eventually these companies will link up with insurance companies.
Also, remember that Irish, French etc are nationalities not ethnicity. And the tests are not as accurate as they claim to be.