I mean, sure, but there's no rule against freewheeling. It's hard to even conceive of an enforceable one: "all participants in a sprint must pedal as hard as they can to the line", is the best I can do. Still seems somewhat arbitrary. Maybe someone else can do better. In any case, it's just not against the rules as they stand. It was an unfathomably unfair DQ and again, I am truly stupefied by the backlash Richeze got. Sprints always divide opinions somewhat, I keep telling myself, but it's hard to shake a certain unease at the rules being bent to accommodate Cavendish's displeasure.
Also, I'm sure Maxi is not an angel in the sprints, but honestly, there was nothing else he could've done. He was going to slow down sooner or later. He opened up around Groves towards the barriers and kept a fairly steady line. Groves was going all out and Richeze was running out of juice. I'm sure he wasn't beaten up about the way it plaid out but there was really no way for him to have helped out Cav there even if he wanted to outside of swerving into Kaden. Which actually would seem to be somewhat against the rules -and perhaps even run counter to what I believe to be fairly universal ethical considerations- as well as most humans' primal tendency towards self-preservation.
I mean feel free to "hate" on Richeze for any stylistic considerations -it's part and parcel of being a sports fan- but it seems a bit much to accuse him of wrongdoing, particularly since it seems to be pretty clear that he broke no actual rules and he almost certainly didn't do what he was accused of doing.