Look at it this way:

I never used WhatsApp. Friends and even businesses I dealt with always asked me if I had it, and why I didn't, and I was apologetic, but firm. Of course I was left out of oh-so-many groups and discussions in the past years, but I was never going to install or use that, I don't trust Facebook regarding privacy the tiniest bit and I think they always lied regarding which data they use and how.

Now I suddenly have so many people appearing on Signal, my wife was asked by their friends: "Hey, you weren't on WhatsApp, but I am now on Signal, so would you consider talking there?".

I admit, I did not push anyone anywhere, not even my wife. I'm past being an "influencer" and having to deal with "... but you told me to use this?!" - particularly my wife.

But just referring to the "network effect" and continue doing something you are uncomfortable with is being complicit IMO. You can control what you do, and do the right thing.