I think what might be considered sleazy by Ivy League academia standards (taking ideas without attribution, deliberately misrepresenting things to potential competitors in order to maneuver around them) happens all the time in the business world and would mostly be classified as "hustling" by entrepreneurs. For an idea to have value by itself in the business world, it must have patent protection. Otherwise, it is freely copyable without attribution and most of the value is derived in the execution of it. This is different than academia, which is mostly about the proper attribution of ideas (though universities will patent ideas that they deem commercially valuable). While it's a fair point to argue that since Facebook was started at Harvard, the ethics of academia should have applied at the time, it has long since morphed into something well outside of that where the rules about copying and attribution are different.