Can't speak for the entire Europe obviously, usage varies from country to country, but where I've been it's pretty well entrenched for bot social and business.
WhatsApp is widely used by UK ministers to communicate with potential donors, lobbyists and other politicians. I don't know why it's allowed; in-person meetings are supposed to have a civil servant present and taking notes. WhatsApp gets them off the FOI hook.
I've lived in both eastern and western Europe and it's used a lot almost everywhere. As far as I can tell, the more Russian-influenced countries tend to use other services.
It's still crazy to me how people use Viber en masse in a lot of those places. The UX is abysmal and it's full of manipulative ads. Habits are hard to change.
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