The biggest issue with a project under big tech giant is that they could afford to trash it at the moment notice.

There is super low commitment on new projects (say <1% of work force), compared to a startup that is betting all money and talent it could get on a chance that there is an overlooked market for product X. 100% focus, staying far from a comfort zone and taking the risk is what (in a very few cases though) makes it work.

Basically tech gaint doesn’t have to “burn the ships” and therefore has lower commitment, poor focus, has no sense of (get big or go home) urgency and eventually drops the idea before it bears fruit.

It can offord to say “pass”, but doesn’t need to “bluf” and it doesn’t have the same risk.