Certain songs will get taken down if you stream them, but they're still licensed.
https://beatsaber.com/faq.html
> Our aim is to release Content ID-free songs for future OSTs as well. However, we cannot guarantee that Content ID will be disabled for paid music packs since they are owned by our third-party partners. We value the work of artists and respect their decision to keep Content ID enabled for the music they create.
https://edm.com/features/inside-the-ambitious-quest-to-licen...
> The ambitious effort to activate Daft Punk in Beat Saber took over two years, according to Vickie Nauman, founder of the Los Angeles-based consultancy and advisory firm CrossBorderWorks. "The collaborative effort was between Beat Saber core team, Warner Music in London and Daft Punk crew," Nauman tells EDM.com.
> Nauman has worked with the title's developer, Beat Games, to execute the company's licensing deals since its early days as an independent gaming studio in Prague, a role in which she remained after Facebook (now Meta) acquired the studio in 2019.