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It is possible that neither of them are lying and that Signal just misinterpreted what the Facebook ad system was telling them and jumped the gun a bit.

This honestly seems most likely to me.

It does mean that Facebook’s messaging is confusing enough to cause that though.

Or they "misinterpreted". Plausible deniability enables this win-win scenarion.

So far even the screenshots Signal posted contradict and disapprove Signal's story, and are in line with what facebook is saying.

Problem is that the images Signal have provided don't really provide much concrete evidence that the ads were rejected after infact being run.