What is the title of the report on data depersonalization?

Question

Information Security

About two years ago, I saw a report on the topic of information security at some conference in Russian. They told how different companies approach the depersonalization of information and the collection of user data. I only remember fragments.
Initially, they said that recently everyone began to receive letters about changing the privacy policy.
Then there was a topic about the fact that it is not enough to hide usernames to depersonalize information, and that, for example, weight 67, height 175, age 33, poor eyesight in the database of some hospital, is not much different from Ivanov Ivan.
The speaker gave an example to the audience, saying that if now I ask you to raise your hand, if you watch porn, then I will not receive statistical data, because some people will be ashamed and will not raise it, because the neighbors will immediately see it. But if I ask you to flip a coin first and, in case of tails, raise your hand, and in the case of heads, raise only if you look, then this randomness will protect your personal data specifically, while leaving the opportunity to observe the statistics. After all, among those who raised their hands, it will be enough to subtract half the hall and get the real distribution.
And then there was a story about specific examples, in particular about how Apple collects information about the characters typed to improve the keyboard experience on its devices. But now I don't remember anything.

Please help, I'm at a dead end, I can't find the report in any way =(

Answer 1

Very similar to one of Arthur Khachuyan's reports. It has a lot of similar ones and all topics are about this, for example:
https://habr.com/ru/company/ua-hosting/blog/483024/
https://habr.com/ru/company/ua-hosting/blog /475130/