For money
1- They have VIP option that is paid. (money)
2- group members are pushing price higher. (money)
3- If group is big enought signal is not nessesary. Group is pumping price. Thats how many signal groups converts to pump and dump groups. Admin of this group of cours buys beafore signal and dump on group members (even more money)

Using signal goups in pointless because you will never learn to trade. When you will make waste trade you will blame leaders and all you will learn from this is that this group is not legit, lets jump to another. Do your own trades. Even if you are unexperienced. Chose lowest possible bid (0,001 btc in binance ~ 8$) and make as mannny mistakes as possible. Learn from each and be better from every.
After few days you will say : i've lost 10$ but learned this and this and this
after few weeks you will say : i've earned 20$ but ive learned this and this and this
after few month you will increase bit and say ; I've earned 2000$ and still learned this and this

What would you say after few month trading by telegram signals?
I learned that this and this and this group is not legit, this is quite good but im still on big waste.  (if you will find 1 legit)