DeepSeek hasn't proven anything except what they say. You're inherently trusting a company's statements over others. When an independent third party corroborates the numbers then we know for sure. Until then, every company is just selling a story for investors and users.
I'm not aware of Chinese law, but I suspect that lying to the public or investors carries risks.
DeepSeek has released their weights so multiple companies can tell you if they're profitable, whereas the ones with closed weights, you will never know, even if they go public, they dont have to publish the actual margin.