You can mitigate it by restricting how many people can be matched with a single email/SN. It's hard to try and out someone out of your whole class when you can

You can mitigate it by restricting how many people can be matched with a single email/SN. It's hard to try and out someone out of your whole class when you can only have 3 'crushes' to use; the odds are low unless you're pretty sure you know who likes you, at which point the service is a little redundant.