Asking someone to add an additional free messaging app is maybe a 2 out of 10 on the effort scale, where 1 is “hand me that thing that’s next to you” and 10 is “give me one of your kidneys”.
You shouldn’t feel bad about asking anyone who claims to care about you for such a small favor even if it didn’t benefit them, but as others have already mentioned, it does.






Signal, and (probably) Whatsapp have end-to-end encryption. It’s better to feed less information into mass surveillance systems when you can.