No sane company include private data in diagnostic data... On top of that openwrt doesn't include ANY kind of service like that. The most stats we have is download numbers to get what target/packages is most used. Nothing else.
Snapshots build is just build done from master branch nothing more than that.
Hey, no harm intended It was just fun to push someone into a self-dug hole
But, yeah. These questions generally cannot be answered one way or another. It is all really about trust, just like everything else in life. I do not check every piece of bread I buy: I simply place my implicit trust into every step on its way from a farm to a store shelf...