Here’s Tim’s tweet:

The link embedded in the tweet takes you to iTunes so you can make a donation to the American Red Cross specifically targeted for Hurricane Harvey relief. I believe this particular path only works in the US.

From the iTunes page:

> Click Donate below the amount you wish to contribute and iTunes will transfer 100% of it to the American Red Cross, which is providing relief efforts for Hurricane Harvey.

100% of the money goes to the American Red Cross. Apple doesn’t take a penny.