The point is psychological and human behaviors.

People don't like being told what to do, so saying "Stop using Facebook/Instagram/WhatsApp/Threads" is going to cause the opposite effect, people will "rebel" and keep using whatever Facebook has.

Another point is inertia (which all of you should know by now)

If you want to stop Meta, I mean "Facebook" you must answer the age old question:

How do you move these users friends over to Mastodon, BlueSky or PixelFed?

If you don't have an answer to this single question, people will continue to use Facebook's products and no amount of "Stop using ..." would solve this.