I can bet with you that 99.9% of them are not true. This is very common on telegram. You get added to a signal providing group and you will be promised of making good return on investment from the signal they will be giving out. The truth of the matter is that many of these groups are working in coordinate with aim of pumping a particular coin and using somebody like you as leverage. They will have many of the similar groups so, in all the groups, they will drop a signal about a particular coin so when you rush to go and buy, you will just discover that the price you are buying might be the highest price the coin will ever reach before it starts to fall back and before you know it you will end up losing your money. This has happened to me in the past. be careful.
People who get caught by the scammer’s techniques are those who do not have enough knowledge of the market and its working. Only few people get the knowledge of the market before starting investments. This is also one of the biggest reasons behind increasing crimes in crypto market. When people don’t understand the strategies they don’t realize that they are moving toward the wrong way.