Just like all other "optional" features Facebook has provided in the past, they will inevitably figure out a way to hide the fact that using these hotspots checks you in, and probably spams your "friends" with a record of whatever you ate.
Also if you look at the page, you can see you can change who you share the check-in with. It's just like Facebook app integrations: you can switch the share settings to "only me" if you want a private check-in if you're worried about spamming others.
