2. Lead a movement to switch away from these apps. This has an insanely high overhead, and requires significant organisation of people and a large individual commitment. This would have a significant effect on Facebook.

This is how I view the problem. This is not an example of people being unwilling to act on their ideals. It's a situation where acting on their ideals would cause them a significant burden with no effect, and causing the intended change would require ridiculously large effort.

It’s hard though, because what alternative do people have?

I didn’t log in to my Facebook account for 7 years, and I got way out of touch with most of my old friends in different cities.