[JCThoughtscream]

...why would it NOT be okay? Startups might need cash, but so do big corps. If we're talking about "donating equivalent to big corporations," then obviously we're talking flights of fancy. But we're not. I'm sure there's tax incentives for it; you've alluded to marketing incentives. But in the end, it's just a matter of whether or not the startup thinks it's financially in a place to do a little good.

Penny Arcade's got a staff size you can count on one hand; they run one of the best-known charities in gaming circles. They're not a Big Co. by any account, even if they've since developed Significant cultural presence.