MIT and Harvard's "largess" is funded in part by tax money collected from deaf people. Anyway, donating to a a discriminatory cause is still discrimination even if it is generous or well-intentioned.
What's the "discriminatory cause" you're talking about here?
It was hypothetical, but I guess you could say that donating courses only to non-deaf people is a cause.
So what about any charitable effort that discriminates on the basis of a protected class. If you can't do something for free to help one group without excluding some others no charity would be possible. Should MIT/Harvard intentionally avoid captioning? No. Should the government force them to use CCing? Hell no.
Your charitable cause is putting some people at a disadvantage then. If your charitable effort somehow must discriminate, it should do it in favor of the less-privileged group.
So, I should only help the bottom 1% and not help the bottom 2% - 5%?