spokeking said:QBA
In the Tour, the last stage is traditionally Ceremonial. The winner is ultimately decided in the final time trial. There is some attacking that goes on when the peloton reaches Paris, but it is mainly the sprinter's teams who are going for points in the Green Jersey competition.
The team of the yellow jersey will be watchful not to let any top GC Contenders get off the front. Also, the stage is flat, so there won't be any major time gaps anyway.
Cycling has lots of unwritten rules, gentlemen's agreements, and codes of conduct that the riders and teams adhere to.
Similar to stealing a base in base ball late in the game when you are ahead several runs.