If you are actually asking a serious question: while a patron is primarily motivated by whatever catches his interest, a corporate conglomerate funding the same investments is motivated by profit. They would have more of a motive to select the kind of investments that will succeed and pay for themselves, allowing for a more economically efficient allocation of resources.

Of course, the kind of investments that might succeed and pay for themselves may not necessarily be the kind that is most beneficial to the public at large - but the same applies to the patron.

It's not, it's just lies they use to justify the existence of a capitalist system that is barely 50 years old.

So obvious what a fucking farce this all is and it's time we start demanding better.