That's certainly right. We don't provide any suggestion based on private data. For example, gamers cannot see the tags of an opponent if the opponent opted out to be private.

I think if people care about their data it should just be anonymized instead of hidden.

Data from games is such a good way for people to get into programming and data analysis (Speaking from personal experience).

It's easily accessible, real and has a decent level of complexity. Would be a shame for it to go away because people want to hide their data.