I think that such guidelines about signals are good, they are basically educational as they explain what signals are, what types they are, who creates them and whether they should be trusted or not, I think that this will be useful for beginners who are deceived by advertisements and fall victim to fake signals.
Personally, I have tried many signals on Telegram, whether free or paid, but the benefit was very little, so I think that it is better not to use them, especially paid ones, while free ones can be tried as long as there is no loss.