The "B" in B Corp doesn't stand for "business." And it most certainly doesn't stand for "bank." It stands for "benefit," as in public benefit corporation, and it means the company is as committed to social change, charity, or serving the public interest as it is to making money.
Kickstarter could've taken the path chosen by a majority of tech startups and angled for a sale, acquisition, or IPO. Instead, the online fundraiser stuck to its altruistic guns and became a B Corp.