The two actions people can take are: 1. Delete Facebook apps, Whatsapp and IG. This can have low to high utility loss for you, but has negligible effect on Facebook. It would have a bad effect for me, who has many family members and friends connected on whatsapp and needs whatsapp to connect to anyone whom I meet in my country.

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.