IME you say “Sorry I only use Signal” and either they change or you don’t get in contact with that person.
If you change and abandon your principles were they really principles in the first place?
How do you tell that to them in the first place? You got someone's phone number. The person who gives it to you tells them that they use whatsapp. You can't even tell them "Sorry I only use Signal" unless you open whatsapp app.
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