Investors will look for 2x, 5x, 10x, 50x, or maybe 100x returns on their investments. So, if you want to secure funding for your game, you should aim for big revenue numbers, or at least make investors believe that your game can make $500M to $1B or more.
On the other hand, when you build a team, it’s better to start step-by-step, gradually building up your skills by releasing small games and then becoming big. But this sustainable model is hard to sell to investors.
So, we have a paradox: you need money to pay your people and make games, but by promising a billion dollars, you put yourself in a position that’s hard to sustain. Furthermore, if you pitch a billion-dollar game, you need to convince your team to make the best possible game, but with an unimaginable objective.
I personally prefer bootstrapping, but the struggle there is finding the right believers. Because, in any case, you need them.