If I had to guess: * Telegram's large groups/channels make collaboration easier and more of a threat. * WhatsApp users who are are all identifiable to the Rus

If I had to guess: * Telegram's large groups/channels make collaboration easier and more of a threat. * WhatsApp users who are are all identifiable to the Russian state via their phone numbers; Telegram allows users to interact anonymously. * Telegram is more widely-used in Russia. * Telegram is Russian, so could be more susceptible to political pressure from the Russian authorities.