Signal was intentionally not using aggressive antisemitism the same way, whole nazi germany got very soft before the olympics 1936 in germany - to spread a false image. Propaganda. So people not yet occupied get a wrong image like "maybe the Nazis are not so bad after all and we can still do buisness". German resistance groups struggled hard to get evidence out. And then it was not believed, because of propaganda like this.

Signal on its own might have been not that big factor, but it was no random butterfly, but willingly part of the bigger propaganda machine, which main purpose was to support nazi domination, which includes the holocaust.