The ones filming aren't courteously approaching people to ask a question; they are provoking a reaction.

This trend isn't new. I've seen people swarmed by TikTokers on the street once or twice, then asked questions to make them look stupid and laughed at. I too was mobbed by a hardbass crowd when that was a meme on social media about ten years ago. I was on a second or third date with someone at a restaurant, and it wholly ruined the mood when my date and I were made fools on some video that luckily never went viral.

It's not strictly dangerous or harmful, but it's definitely not a social interaction most people want. When you are the subject, it feels like you've been taken advantage of against your will, and publicly humiliated. And if the video goes viral, that's exactly what you will be.