Is catfishing a sin if it’s used for a constructive purpose? ?

What if it’s done to prove someone’s husband would cheat on them with a stranger? Proof for her so she can finally leave an abusive (mentally, emotionally and physically) relationship. She believes she can only leave him (break the marriage vow) if he were to cheat on her.

Nah, don’t do it
Get her her freedom
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Is catfishing a sin if it’s used for a constructive purpose? ?
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