Some random apps also seem to be shutting down, out of the blue.

Twitter’s apps for Roku, Android TV, and Xbox are no longer available. Klout, Favstar, and a multiplayer game called Super Monday Night Combat are dead.

Instapaper is temporarily shutting off access to European users, while an online game called Ragnarok Online is shutting down European servers after a decade in operation and, the inbox declutter app, is closing its service to European users. A Chinese smart home company named Yeelight even disabled its Wi-Fi-connected lightbulbs.

Companies are desperate to comply with GDPR, because if they don’t, there’s a fine of up to 4% of their global revenue or 20 million euros (whichever is higher).

To put that into perspective, last year Apple made $229.2 billion (or 195,553,440,000 euros) in revenue, and 4% of that is $9-ish billion.

So, what the heck is GDPR? The first thing you need to understand is that apps and websites collect all sorts of data — or personal information — about you.

That data can include things like your name, gender, marital status, age, or where you live. Collecting that information, and using it to show you targeted advertisements, is how a lot of apps and websites offer their services for free.

But data collection can easily go overboard. In 2010, Facebook invited app developers to make games and apps on its platform and gave them access to extensive user data. Your notes! Your friends’ names! Your religion! Your chat online…