That said, have I hung on them and built TR anchors from them? Yep, repeatedly. And they're cheap.
By comparison, the cheapest actual climbing carabiner you can find relatively easily Costs only about $6 and is rated at 24kN, or roughly 5400# ( I know I know, kn's are a measurement of force not weight but it's a good enough ballpark for these purposes ) and weighs only 50 grams. Plus it's all aluminum and will never seize or rust. And they are made specifically to prevent plumetting death.