Your WhatsApp activity can be monitored, no matter what
One of the very key problems with WhatsApp is the fact that very few of its users actually realize that their behavior can be tracked in real-time, no matter what.
Everyone using the popular messaging app knows the fact that WhatsApp shows your "last seen" status by default. And some also know that the "last seen" data can be hidden through WhatsApp's settings.
But you can't hide the "online now" status which appears whenever you open the app. And that particular information is available to all WhatsApp users, not just to your contacts. So, anyone who knows your phone number, gets the information when you're online.
Now, there are tons of apps and services available that hook into that data. Basically, you download one of those apps and tell which phone number you want to start monitoring. Then, the app tracks, anonymously, when the given phone number appears online and records that. And as the app "pings" the status every 30 seconds or so, you'll soon get a full picture of when the particular user was using his/her WhatsApp.
From that data, after, say two weeks' worth of monitoring, one can easily draw conclusions on user's sleeping patterns, when they might have been in night club, etc.

You know that feeling when you wanted to watch some good olde music videos from 1980s on YouTube, just to realize two hours later that you've spent the past hour watching conspiracy theories explaining how 5G networks caused liberal lesbians to invent coronavirus in order to replace all world leaders with lizards? Yeah. That feeling.
Back in the day, in 1980s, the world was mostly dominated by Commodore 64. But handful of countries, most notably, Netherlands, Japan, Brazil, Spain and Finland, had an alternative, too.




