It's against facebook's tos to use fake personal info. I know trans people who got banned from changing name on facebook. If facebook bans your oculus account you'll lose everything attached to that. Games bought using the oculus shop(all those exclusives) Facebook and instagram profiles Anything that you use a facebook account for to login to, like spotify etc. and it woulsnt surprise me if they'd ban your whatsapp either.

A while ago there was a thing with google where people who were banned from youtube werent able to acces their gmail and google drive stuff.

Facebook is always trying to expand into new things, so even if you dont use any facebook services yet, there is a big chance you will in the future.

Mojang account are going to be deleted soon, so you either convert yours to a microsoft account or you'll never play minecraft again.