So it doesn't say in the rules that a speed advantage means move out of the way. Like I said before he found a way inside the rules to block against those DRS (which I think should be banned from F1) overtakes. If they find it to dangerous they should change the rules. But for now its possible and the only way not to be a sitting duck.
Overtaking is a art not a button you push. And Max can overtake without DRS like he did last year in Spa.
But you should be careful when defending against someone with a speed advantage, like Milos mentioned above. Also lots have drivers have overtaken without DRS, what's your point? (And Max overtakes with DRS as well)