Harry settled because he got burned from the first part of the case and I suspect they took what the Mirror offered because his legal team had a feeling the Justice would burn Harry again.
I seem to remember before the all the legal cases started Harry made the statement that it wasn't about the money, and any money would go to charity. I know Meghan made the claim, the money she got went to charity..Archewell. Harry showed his true nature when he didn't get the money from the first Mirror judgement...he "demanded a new trial, he wanted a large monetary judgement", it's all hot air and money making for both.
He can use some of the money to pay off the fees from dropping his libel case with the DM. Sure.
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