Data breaches are now daily occurrences and can happen to any business. The April 2021 leak of 533 million Facebook records was one of the largest known data leaks, but even if you weren't affected by that one, you may still be at risk.
There is no easy way to know if your information has been leaked. When a business is hacked, it typically sends a notification letting you know, but this isn’t guaranteed. And you can’t go in and check the Dark Web. It is difficult to find and dangerous to access, and that is why the bad guys like it.