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Whatsapp is kinda ubiquitous in some EMEA countries where stuff like iMessage is virtually unused

It's used for much more than that. I know many health care providers who use it for internal communication. (No need to lecture me - I'm not a health care provider, or a decision maker.)

Everyone in South America uses WhatsApp, in which countries does it have the fame of being the scammer's tool?

In the end, what platform is free from scammers?

4chan.

Hear me out:

No sane person would accept business opportunities presented there as anything other than a scam. Since this keeps people from engaging with potential scams, scams cannot actually work as scams. Thus, scammers are relegated to simple sh*tposting.

huh? It's the "default messaging app" for many countries, more than SMS use etc

Yes