Most who are generous do not wish to advertise their gifts. That's why it's not visible.
I saw at a grocery store someone who got to the counter with her food, and when it came down to purchase them she reached in her purse and couldn't locate her wallet. She told the clerk to leave the bag of groceries aside and she would return later after she had located her wallet. When she returned and offered to pay for her groceries, the clerk told her that it was already paid by the person who was behind her in the line. That grocery bill was approx $100.00. The purchaser didn't want to be identified.
These acts of kindness are being conducted by many and not just JW's. But, in this case, it was a JW who did this to a stranger.