That was my first thought too. My next thoughts were:

- it protects the platform, to some extent, by reducing the number of unwanted screenshots

- it sets a social norm that taking screenshots is unwanted and makes the screenshot taker look extra creepy if they share the image with anyone

- if a platform provides screenshot blocking, and users (who have all seen pictures of one screen taken from another device) value that protection and make decisions about what to post based on it, the company should think long and hard before deploying a version that breaks that assumption