I think it's an equally valid technique in both industries. It's just been around longer in the film industry which has a similar pitch-for-play financing cult

I think it's an equally valid technique in both industries. It's just been around longer in the film industry which has a similar pitch-for-play financing culture as silicon valley, except it's been that way for quite a long time (since the collapse of the studio system really) so there's been a lot longer of the ecosystem to develop a culture of fast-talking pitchmen who may or may not have any substance, but are certainly ripe for satire and mockery either way.