WTF? No he isn't -- or at least, not for this reason!
In order to be a "coward," Zuckerberg would have to be capitulating to Trump involuntarily, acting against his better nature. That's not what's going on here! Zuckerberg does not have a better nature, and is probably quietly thrilled that Trump is giving him political cover to do what he undoubtedly always wanted to do in the first place.
Sure, a headline calling Zuckerberg a "coward" sounds pretty unflattering at first, and it is, but it's a fuck-ton less unflattering than a frank description of Zuckerberg as the fascist, sociopathic, complete monster devoid of humanity that he actually is.
Frankly, I am sick and tired of articles like this trying to paint billionaire plutocrats as some kind of victims of Trump's fascism instead of the enthusiastic accomplices that they actually are. I consider them to be absolutely misguided at best, if not deliberate limited hangouts and therefore pro-plutocrat propaganda.
Stop giving these scum credit that they absolutely do not deserve!