Harmonix has also been supporting Rock Band 4 DLC releases for eight years, so that might be a factor too.
Rock Band 4 never made it to PC. Developer Harmonix said in 2015 that it was uncertain whether there was a sufficient audience for the game on PC, and then in 2016 it proved that worry valid by launching a crowdfunding campaign for a PC version that barely achieved half of its $1.5 million goal. But none of that matters now anyway, because Harmonix announced today that January 25 will be the end of the road for Rock Band 4 DLC releases.
Harmonix put out a lot of music for Rock Band 4 over the years: Nearly 3,000 songs, and more than 3,000 if you include game soundtracks. And to be clear, those songs won’t be going away: Product manager Daniel Sussman said live services for Rock Band 4 will continue as usual, and „you can play the songs you own within Rock Band 4 for as long as you like.“
But Harmonix was acquired by Epic Games in November 2021 with the idea that the studio would „work with Epic to create musical journeys and gameplay for Fortnite,“ and that’s apparently where the focus is these days.