We added the unique ID so that we have a way to count unique users without logging IP addresses.
Your Privacy Policy (which oddly enough I've never seen before now) says that you only log IP addresses. Which is it?
https://i.imgur.com/6xPsGpU.jpgCollecting 32 bits worth of people's usernames is not mentioned in the Privacy Policy at all, ergo you shouldn't be doing it. It also mentions nothing about sending it to Amazon S3, or to Cloudflare which you use to host the ping domains.