One of the useful things she's done is to put up lots of videos of her running around Shenzhen. There aren't enough ground-level videos of the working parts of Chinese cities. There's extensive coverage of Tokyo, by comparison. It's interesting to see the high-density housing blocks and street-level activity. (The "let's increase housing density" crowd from Strong Towns should watch those videos.) People who've met her report that she knows Shenzhen very well, down to the back alley level, where some unmarked door leads to an important factory. She's toured the electronics markets of Huaqiangbei. (I miss the days when Silicon Valley had electronics parts stores.)
She's done some nice technical work. Her main thing is 3D printing, and she came up with the first angled 3D printer that worked reliably. The print head moves in a plane 45 degrees from vertical, and the base surface is a belt, which advances the workpiece one layer at a time. So it can produce objects continuously, or very long objects if you add support rollers. Others had made prototypes of such machines, but the properties of the belt and print head are touchy to make that work right. She got it all working, and it's now a product, with her picture on the box.
At various times she's pushed on GPL compliance, mask quality, and other issues of interest to the tech community.
She wears skimpy outfits sometimes. So what? That's most of Instagram. Unlike most Instagrammers, Wu has something original to say. Sometimes with a biting wit. I gather that it's more biting in Cantonese.