At what point does it end though? Do you think every company should issue a statement about every social/political movement or issue that arises? I don't get what Nintendo announcing "we are donating X dollars to cancer research" accomplishes that the donation itself without the announcement doesn't. Are people going to look at it and say "I've never thought about donating to cancer research, maybe now I should!" I don't really think that's realistic.
In an ideal world every company would bring attention to all of the problems we all face but it's not an ideal world, and these companies don't exist to bring attention to these issues. The fact that so many are bringing this up is interesting in various ways, as some of them seem like hollow PR grabs, some seem toothless, and others seem sincere and serious, so it's hard to tell the motivation behind all of these announcements and statements.
But it's not hard to tell the motivation behind anonymous donations, and that's why I find it to be so admirable. You're giving money to a cause without trying to seek any recognition/reward for that act. In this case they both did that and brought attention to the cause because attention is probably more important for this issue than donations actually are.