Earlier quoted context omitted.
they should have a minimum level of compatibility. that's the meaning of a standard. that's why DVD players can play any DVD, no matter who manufactured it. open standards means open competition. if in the future, only browsers who can implement the EME can survive, it will kill the small start up browser who other wise would have innovated and beat the incumbent.
> that's why DVD players can play any DVD, no matter who manufactured it This is not entirely true though: a US-bought DVD player won't accept to play DVDs bought in China, Europe, Australia, etc.
But with this EME, you now is forced to use the US made dvd player, for no good reason other than profit for the encumbent.