From a Chinese political perspective, this is a good move in the long term. From Deepseek's perspective, however, this is clearly NOT the case, as it causes the company to lose some (or even most?) of its competitiveness and fall behind in the race.

There is a history of important Chinese personnel being kidnapped by e.g. the US when abroad. There is also a lot of talk in western countries about "banning Chinese [all presumed spies/propagandists/agents] from entering". On a good faith basis, one would think China banning people from leaving is a good thing that aligns with western desires, and should thus be applauded. So painting the policy as sinister tells me that the real desire is something entirely different.