Comment by Tomte

This is some strange notion of zero-knowledge.

If Bob publishes his link, and I want to know who his crush is, I can simply try all our classmates' names and quickly find out that it's Alice.

Those games only make at least a bit of sense when everybody enters their crush and only when matching both get notified.

Also brute-forceable, but at least it's quadratic (if you suspect nothing about crushes, which is unrealistic in itself).