They might of updated there TOS but nothing has changed, you can still sideload everything just as normal, all that is different is a message at the top saying

They might of updated there TOS but nothing has changed, you can still sideload everything just as normal, all that is different is a message at the top saying illicit mods and privacy are against TOS. I too bought the quest when custom songs became a thing, but found i didn't really like beat saber and perfered BoxVR instead, I don't mind the songs in BoxVR, I only wanted custom songs in Beat Saber because the original songs are cancer but most customs don't flow that well.