We are in 2024 and they still use the word "race" to segregate the American population in several groups. So no surprise a DNA service could be so popular in the USA.
If they were American citizen and just that - without subdivision and the legal right to ask or use their gene, color skin or whatever_they_think_is_important_to_distinguish_themself - well a lot of issues and strange "behaviour" (aka racisme) would have disapeared.
Or at least decreased as nobody would have the legal tools and data to enforce it: gerrymanding, blaming a vote on a "community", having your town split in "community" sectors and no shame at all to call it like that officially! Which others country put "chinatown" on their map?
As a teenager, I was shocked by this fact when visiting the USA 25 years ago. That and the fact i have found in a normal marketplace unprotected ammunition sold near the baby milk. "baby stuff, baby stuff, 9mm ammo... what!?!"
This DNA service is just the result of this global problem: the american society and its laws are still allowing passive racism.
So americans want to prove (to themself, to others?) via DNA results that they can’t be racist because they have a black friend sorry : black DNA ancestors.
Some will tell you: "ho it’s just for fun". But is fun really the only motivation here?
And congrat to them as they don’t only expose themself (genetic data are priceless and should be protected at all costs) but also they expose all their children, children's children, etc. These chidren probably wouldn’t have agreed to that if they were born.