For popular messengers such as Telegram, Signal and WhatsApp, there are quite a few alternative clients (not to be confused with clients as in (human) customers; whoever opted this confusing language needs a good talking to) out there. Such modified apps — known as mods — often provide users with features and capabilities that aren’t available in the official clients.
While WhatsApp disapproves of mods — periodically banning them from official app stores, not only has Telegram never waged war on alternative clients, it actively encourages their creation, so Telegram mods are popping up like mushrooms. But are they safe?