2 million walking means that the walking person or object itself is worth 2 million.

The Measures for Rewarding Clues of Citizens Reporting Spy Activities promulgated and implemented by Beijing National Security Bureau on April 17 mentioned that 10 to 500,000 yuan will be awarded for clues that play a particularly important role in preventing and stopping espionage activities or detecting espionage cases. So if you catch a spy, you catch 500 thousand, and the spy becomes 500 thousand walking.