Hear me out.
Hikers, walkers, active people, have been using thermos or Stanley for years to keep drinks HOT while they are out and have managed to keep quiet about it.
Now generic tiktok person has introduced other generic tiktok person to insulated cups and suddenly it’s an internet sensation.
I put it to you that if anyone was a fairly active person to start with, they’d already own a Stanley or Thermos to start with for those long journeys. And this wouldn’t be a must buy, as you’d already have it. These are mostly for people who sit down, don’t move to refresh their water, and want their drink to stay cool for several hours at their side.