Moving from WhatsApp to a different messenger, that's already a big issue even today.

Here in Europe, there is a significant exodus of people who want to leave all Meta products behind because they do not support Meta's close ties to the Trump/MAGA government or other reprehensible behaviors of these tech giants.

However, many people, especially older people, have difficulty with such a change, simply because they lack technical knowledge. Many also fear losing their network during such a move.

The psychological costs of such a migration shouldn't be underestimated. There's a lot of social inertia.

Cory Doctorow @pluralistic@mamot.fr has described in detail the specifics and background of how people are held hostage on these tech platforms.