Sure, it's not, but use it as a "cash" in your shirt pocket, you'd put $1000 in your pocket, come on, it's always common sense.
In fact, it is something that would be used to receive those rewards you mention.
On the other hand, access to that wallet does not have to be conditional on your Telegram credentials, that is, having the private keys, you should recover the funds.
People (users here) always want to see these products as something bad, sometimes it's just a matter of knowing what you use them for, Telegram is still a social network, so don't store money there that you can't afford to lose.
If you do not recover the credentials, it is because the account does not belong to you, do not believe all the stories of your friends, be careful with that, do not lend your Telegram account with the excuse of; "with your account I can solve my problem"