A software system is ~3 times harder than a weekend-garage program, and a software product is ~3 times harder than a software system, so you're at 9 times the work before even starting to go into all the work marketing and selling it and doing the internal overhead work to make sure that the organization is ready to sell and support the new product when it's ready...
Also a billion dollar company has a lot more to loose than a few interesting weirdos working on a weekend project, and so rightly expect more risk management reviews.
A software system is ~3 times harder than a weekend-garage program, and a software product is ~3 times harder than a software system, so you're at 9 times the work before even starting to go into all the work marketing and selling it and doing the internal overhead work to make sure that the organization is ready to sell and support the new product when it's ready...
Also a billion dollar company has a lot more to loose than a few interesting weirdos working on a weekend project, and so rightly expect more risk management reviews.