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Where do you live? In most countries, yes - not wearing a seatbelt is a traffic violation that comes with a fine, and in many places the driver is responsible even if passengers aren't buckled up. The exact amount varies by location, but it's usually somewhere between $20 and a few hundred dollars depending on your jurisdiction. Some regions also add points to your license or other penalties, so it's worth just clicking that belt every time you get in the car.
The fine depends entirely on jurisdiction, but yeah, most places do penalize it - what's worth noting is that in a lot of regions the driver gets hit with the violation even if a passenger refuses to buckle up, which catches people off guard.
Absolutely - it's illegal in pretty much every developed country and you'll get fined for it. The amount varies wildly depending on where you are, but the key thing that hasn't been hammered home yet is that in a lot of places, even if you're the passenger, the *driver* can still face the penalty if you're not buckled in, which is why it's worth actually checking your back seat before hitting the road.
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