Rules/Policy About Player Data Collection?

I can’t seem to find a topic covering this, nor can I find it with a quick search elsewhere. I’m wondering what the rules are regarding general data collection (anonymous user statistics) and player data collection (collecting player-specific data, but only used in the context of that specific player).

Note that I’m exclusively referring to collecting data by normal means that Roblox’s API allows for, and nothing collected from user input. This is also strictly excluding any personal data obviously.

An example of this might be player data collection for the purpose of a recommendation algorithm. One that is only available for that specific player.