There ought to be decent number of people within Microsoft who have "Copilot usage" as a KPI. I don't think this was gamesmanship on their part (no sarcasm, I truly do not suspect malice), but I'm sure if it could have slipped in without backlash, they would have enjoyed seeing their line go up.
Not suspecting malice from Microslop is an untenable and unsafe position.
Sorry, I don't see another plausible motive than KPIs must go up. The change came from a product manager and was also reviewed and approved by one or two apparently senior developers. They may have tried to slip it in accidentally on purpose.