Don't use telegram unless it's very important that you must use it.
Make sure you are in your lane, don't cross your boundaries by giving attention to PMs, it's even better if you can deactivate PMs under your telegram settings, strangers have nothing good to offer you especially on telegram, they are there to use you and dump you right after they are done with you.
Anyone that PMs you first don't mean well for you, any crypto telegram group you join always be the one to PM the team first, most of the times they will have signs like this..
Victor | I don't PM first.
Micheal | will never PM first.
That's because some scammers are impersonating the teams, and they will drain your wallet if possible, if you have a problem find the team and PM them first, don't enter the group and tell everyone that you are facing a problem, they will bombard you with fake profiles instantly.
Its fine to use Telegram and nothing wrong with this platform.
The problem will start only if you entertain those random messages will pop up on your inbox. If you set your setting that "anyone which is not in your contact on telegram can't send you a message" Most provably you won't get bothered by scammers.
Awareness about scam is your weapon to avoid any harm by using this app. Also make sure to verify your contacts if they are legitimate or not.