That's a key difference between Signal and Whatsapp. The first now comes with a lot of evangelization from current users, and people in general are just sick and tired or just deaf to any kind of "activism" trying to determine their lives. We live in a very loud world.

To be successful, Whatsapp's replacement, whatever that is, should be perceived as not a huge leap but have the right ingredients for people to naturally switch (think Unix worse-is-better philosophy), or just come with lots of positive, not negative, associations. "X is evil" is just not doing it for a lot of people.