Tellingly, this program covered all butterfly-switch MacBook models, including those that were introduced after the repair program was started, suggesting that the design was flawed in ways Apple could not address with hardware revisions.
Apple re-introduced a modified scissor-switch keyboard in the 16-inch MacBook Pro in late 2019, and all MacBooks introduced since then have continued to use scissor-switch designs.
For users who are currently using a broken butterfly-switch keyboard, Apple's Keyboard Service Program is still active, though the number of models it covers is slowly dwindling as time passes.The program "covers eligible MacBook, MacBook Air, and MacBook Pro models for 4 years after the first retail sale of the unit," which at this point would mostly exclude the first wave of butterfly-keyboard Macs introduced between 2015 and 2017.