Just don't use the account for anything else.
Maybe they ban them if you try to buy something (because the name doesn't match or something)? Which would be a ridiculous thing to do, but hey, I've seen worse...
Regardless, I just don't see any use for Facebook besides messaging. Sad that Oculus headsets require FB accounts.
I believe that with heavy handed actions like this, Facebook will alienate Oculus buyers, which aren't your typical Facebook user. I hope that will make them change their approach.
Personally, I couldn't care less about customized ads and "relevant" notifications. But getting your account banned, with all the contacts on it, and all the purchases, is just so anti-customer I don't understand who in their right mind would do it.
They definitely will, I wanted to get my first VR headset and that move took Oculus out of the running for me. I was leaning towards their headsets because local pricing for Vive -- not to mention Index -- is horrible, but there's no way I'm linking it to my Facebook.