for someone who thought Tea was a good idea, what would be the objection be if this leaked contributor data were used to populate a similar app to warn men off?
There's no objection, but it doesn't work because men compete while women collude.
This has evolutionary origins. A man can, theoretically, father around a thousand children or more in the time it takes a woman to bear one. Sperm are cheap so those who need sperm (i.e. women) don't need to fight with each other. There's plenty to go around. Eggs are scarce so males of myriad species fight each other to the death over them.
obviously it would be malicious and unethical, but since that didn't seem to stop Tea users, I'd be interested in what their arguments against it would be.