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But a messaging program like Signal is fairly similar in scope, but only has like a couple dozen of devs, compared to Messenger's thousands(?).

Signal could definitely use a bunch more devs, if only to fix all the UX bugs I hit on a daily basis.

You haven't used messenger much then, if you're comparing the complexity of the two.

I guess I don't understand which are the features Messenger has that Signal doesn't that requires a billion dollars a year to maintain.

I don't use it. What am I missing?