Haha I can think of a few leaders of other nations who might enjoy this power.
Of course I have sympathy for refugees of all sorts. However, although the Chagossians were definitely screwed out of their home, it doesn't follow that they have been screwed out of ".io" money. It is an accident of history that TLDs are relatively scarce, that national governments may extract economic rents from TLDs, that some ccTLDs have no corresponding national government, and that the UK happens to own ".io". Nothing any Chagossian ever did entitles her or her descendants to this money.
In a better world than ours, there would be billions of TLDs, and the value of any one of them would be negligible.