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This is a good reason no one should trust your exchange service because this is a common tactics used by scammers. Why referring people to your Telegram account when you are not yet a trusted person on this forum?
Because, as you said, it's a common tactic from those who want to phish ignorant and naive people. I'm not saying that everybody who communicates through TG is a scammer, but we all know and have seen imposters and scam attempts.
What did you mean as you can buy PayPal balance? Something like the seller can sell you his PayPal account?
As I see it, OP most likely refers to the PayPal balance of the account. Someone who has a PayPal balance can sell it to him, and he will send crypto to you. Of course, dealing with PayPal with a total stranger isn't the best/recommended way.