Washington, DC is making buses fare-free within the District: https://www.washingtonpost.com/transportation/2022/12/06/dc-council-free-metrobus-vote/
And as a reminder, Kansas City has had fare-free transit for three years now, and it's working really well: https://nextcity.org/urbanist-news/kansas-city-zero-fare-free-transit-program-shows-major-success