There is no security risk, but in the contract LikeRegistry having the mapping likes and matches does expose the internal relationship - example, who has liked whom etc.
showing the mapping of likes and matches to everyone.
Data Exposure and Privacy of the informatin from the app: Users might assume that certain interactions or relationships are private or not easily accessible to others. Exposing such data might lead to privacy concerns or misus.
Manual review
Having this mapping as private and create custom getters.
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