There are lots of issues with the accuracy of that stuff, but even if there weren't, really, what does it matter, if you don't have any sort of connection to the places your forebears were from anymore?
I don’t know, I feel it connects and grounds us to know a thing of our past. I like to ask people about their ancestry as part of bantering and I’ve had a lot of interesting conversations that way.
I’m a fourth generation American of Eastern European Jewish background and I’ve been able to track my ancestry back into specific countries in Eastern Europe via documentation I’ve dug up on ancestry.com but haven’t gotten further. I’ve found it a fascinating exercise. I have not been able to determine the source of my surname (Soffian) which still remains a curiosity for me. Sometimes you uncover interesting artifacts. I learned I had a great uncle who immigrated to America from Romania aboard the RMS Carpathia in 1904. Eight years later in 1912, this would be the first ship to come to the Titanic’s rescue, and six years after that would itself be sunk by a U-Boat. My great uncle had left Romania likely to escape anti-semitism. He’d eventually find his way out to Denver. Sadly, he’d die in 1918 (the same year the Carpathia was sunk) at the age of 25, very probably from the flu.
This was him btw, along with his headstone and declaration of intent to become a citizen:
My wife convinced me to do one of those this year actually - not 23andme, maybe ancestry.com? It's the one where you spit in a tube and mail it in. The results came back 98% Caucasian, northern Europe, and a lot of other stuff that looked like they just randomly made it up to make me feel like they really did something. I told one of my (Mexican) wife's (Mexican) friends that the results confirmed that I'm the whitest white guy in town and he said, "I could have save you $200 and told you that!"
Try 23andme?