Most of those riddles work like this: they show you three bottles and say "guess which one weighs more" but they never give you the data you need. The video makes you think there's a clever solution when really it's just missing information. Some use visual tricks (taller bottles that look empty, or full of water vs air) but the video cuts off before revealing the answer because... well, it's pure clickbait. If they don't tell you the density of the liquid, the material of the bottle, or how much each one contains, there's no riddle worth solving.
What usually happens is people in the comments propose different solutions and they all "work" in everyone's head because the riddle is poorly set up from the start. Some videos don't even have a real answer. If you find one that promises "the definitive solution," it's almost always because the creator just arbitrarily decided which one was "correct" with no logical basis.
If you enjoy solving problems like that, you're better off looking for classic logic riddles that actually have a verifiable answer. The ones circulating on TikTok are designed to get you to share them, not to learn. Save yourself the time.