Very sad for the United Kingdom, I think. Back in 1982 Queen Elizabeth II refused to give up the Falklands at gunpoint; in 2024 King Charles III gives up the British Indian Ocean Territory without even a shot being fired.
Whereas Chagos Islands inhabitants were violently expulsed and the only people on site are occupation forces.
And the poor folks who were expelled (and their descendants) were not even consulted this time around — this is purely a deal between the United Kingdom and Mauritius, whose only relationship with the islands is that they were both lumped together under the old colonial administration.