I think several factors are at work here. First, birch bark really is a universal material - it's lightweight, looks beautiful, and it's easy to work with, even if you're a beginner at it. And second, social media loves anything you can show as a process: weaving, carving, sanding - it's all really mesmerizing and satisfying to watch. That's why it spreads as short videos everywhere.
I myself went into a craft supply store once and saw finished birch bark blanks - thought, why not. Bought some, played around with them, made a few things. It's genuinely nice: the material smells good, it feels warm to the touch, and the result looks expensive for minimal effort. But I don't really rely on the magic of talismans - I just like having something beautiful that I made myself.
If you want to try it - why not. But don't get hung up on it having to be a talisman or charm specifically. Just make what you enjoy, see how it turns out. And when the hype on social media dies down, the hobby might stick with you or move on to something else. That's fine.