Telegram is great if you like shiny native features like stickers and having lightweight native clients, but at everything else Telegram is at risk of losing in the long-term.
The big reason for this is that Telegram decided to roll everything mostly on their own (including e.g. MTProto), Telegram is not compatible with Matrix unless you use a bridge, it is not e2e encrypted (unless you use mobile 1-to-1 secret chats. The server side code is proprietary, and the builds of the clients that are published to the app stores could be anything.
While I love using Telegram right now for talking to some groups of friends, I would look at supporting https://matrix.org , since it will likely become the de-facto standard of building messaging platforms.
The big reason for this is that Telegram decided to roll everything mostly on their own (including e.g. MTProto), Telegram is not compatible with Matrix unless you use a bridge, it is not e2e encrypted (unless you use mobile 1-to-1 secret chats. The server side code is proprietary, and the builds of the clients that are published to the app stores could be anything.
While I love using Telegram right now for talking to some groups of friends, I would look at supporting https://matrix.org , since it will likely become the de-facto standard of building messaging platforms.