Not popular, just chatty
I use a third-party DNS to block all manner of nasties, and after installing the tiktok app on my phone, opening it once and never touching it again, it was comfortably the most common DNS query run out of my (fairly techy, four-person, smarthome gear, WFH full time) home network.
I blocked it from using background data, which helped enormously, but it was still managing to squeak out some traffic, somehow.
I put it to you, Cloudflare, that what you have here is a ranking of the most inefficiently (deceptively?) written apps...