Is joining to that group for free. your aiming are not for profit, I do not use Telegram why not create a website i will view updates on the site and visit it daily. If you have enough traffic, you can sell ads and you may get more money while you trade. Telegram group are usually filled with spam some sold it when have +kkk followers .
Telegram is just easy for me to feed my market commentary. This is completely free, I mostly run a discord for cryptocurrency trading and I use this to channel my charts so that they don't get lost in community chatter.