Education policy is not the domain of those who understand education - it's decided by politicians at nearly every level. Everything from what will be taught, to the books we use, to the structure of classes and rating systems meant to produce specific results without any real understanding of how those results are achieved or the real impact of them. They also can't make radical leaps - anything that might fail would result in losing their position, so they stick to minor modifications to existing systems - so there's no disruptive changes possible, as per Ken Robinson.
All that while fighting through often biased or partisan processes that result in, for example, including religion and denouncing evolution in Texas schoolbooks. In fact, you can say that government run institutions are process-driven more than anything else.
On the other hand, businesses are results driven. A business that does not produce product will shortly cease to be a business. That mechanism lends itself well to tackling any problem, even if it often discards moral or ethical considerations as not being part of the problem scope. So while their primary focus is of course, profits rather than education, when education is a requirement for profits, they're both well situated and motivated to provide that.
They can even take risks, with the knowledge that success will reward them many times over. So new styles of education are realistically evaluated and considered.
That's the nice part about capitalism. We can rely on human greed and ingenuity to produce almost any result, so long as we're able to figure out how to make it a requirement for fiscal success, whereas the political systems are motivated to not take chances and not to rock the boat, while at the same time claiming to be a boat-rocker.
So yeah, there's some PR gain in there for those companies, but that's just icing on the cake compared to their main benefit from supporting or redefining education.
 - See http://www.ted.com/talks/ken_r... ,
for some interesting thoughts on disrupting the existing educational systems.