Network effects amplify the marginal impact on the individual, because they lead to a monopoly with no true competition. Sure, you can leave whatsapp for signal, but you can’t talk to that community group on WhatsApp from signal. From an individual’s point of view the market power is an absolute monopoly.
The only solution to these problems is organising to the level of a mass boycott, or regulatory intervention. The former is impossible because too many people don’t care about the company’s behaviour (not because they’re ignorant, they just don’t care) and the latter is slow and a very hard and unfun pursuit for campaigners.
Nothing we say to non nerds will be of sufficient magnitude on an individual level. It’d have to be collective action.
Personally I’m far more worried about Facebook undermining democracy right now. That’s sufficient reason to shut them down.