What does Facebook really gain from buying them? Facebook is making their own social vr platform, why would they want a separate platform, they cannot make use

What does Facebook really gain from buying them? Facebook is making their own social vr platform, why would they want a separate platform, they cannot make use of the tech and the player base is not large enough to matter. Not to mention that they would be forced to check every single uploaded piece of content that has ever been uploaded for copyright as they would quickly be hit for those things after being acquired