Your comment makes it less likely that others will broadcast their charitable giving, result in less people being prompted to give, and overall reduce the amount of giving in the world; all for no gain for yourself or anyone else. You want "a bit sad"? Dwell on that for a while.
My point is that by not acknowledging the selfish part of "wanting the credit", the author comes off as not self aware [or disingenuous, but let's give them the benefit of the doubt]. That's what I meant by cheapening it for them.
Re: "cheapening", who exactly is ranking the charitable act and why does their perspective matter? I was raised with that ideology but eventually abandoned it.
Nowadays, I care a lot more that something helpful is done that the signaling attempt to admit our desire for recognition or hide our involvement in the good deed because that mindset prevents a lot of helpful giving in my experience.