The jaws are made by metal injection molding, MIM for short. It's a good way to make some pretty complex shapes repeatedly and relatively cheaply. And they are also ready to use as is for many items and the rest, just minor secondary operations are needed.

Lot's of metal items around you are made by MIM. And it's great for those things. But while it's "good enough" for your multi-tool jaws most of the time, it's not a process that is as tough as a forged tool. There some stress riser areas in those jaws. Look at the sharper corners. An easy way to break those jaws is to grab something hard out at the very tips of the jaws and squeeze hard.

Multi-tools are a fine tool to carry for an emergency when nothing better is available. Or the job at hand is just a quick light task. Anything else, go get the proper tool.