Apple continues to sell MacBooks, MacBook Pros and MacBook Airs with the butterfly keyboard. At this moment in time its advice to users facing issues is to ‘contact customer service’ although it also suggests using compressed air to keep the keyboard clean.
https://www.engadget.com/2019/03/27/apple-3rd-gen-butterfly-keyboard-problems/?utm_medium=newsletter&utm_source=morningafter
https://www.forbes.com/sites/ewanspence/2019/03/27/apple-macbook-pro-butterfly-keyboard-serious-problem-confirmed/#28dd0db7917e
Apple program
https://www.apple.com/support/keyboard-service-program-for-macbook-and-macbook-pro/