Perhaps because they never admitted there was an issue. Whoever bought the upgraded MacBook pros with the upgraded butterfly keyboard for the last 2-3 years are probably mad that they got a mediocre product advertised as superior. At least Apple should offer a keyboard replacement/fix program at a lower rate like they did with the iPhone battery.

Edit: Apple did announce a keyboard service program for affected users.

https://www.apple.com/support/keyboard-service-program-for-m...