If you want to have a wallet inside Telegram, then there are a lot of verified non-custodial bot wallets, including those from well-known crypto exchanges.
I will even not use anything that is third party. Example is a wallet on Telegram provided by a bot or to make use of an exchange service. I prefer to access the exchange directly or download the wallet instead and use it without any third party. Anything that has to do with exchanges and wallet, I prefer to avoid third-party (like Telegram in this case).
Of course this is correct. It is better to use any wallet directly, rather than through some other service. But basically, Telegram has such an opportunity if someone absolutely needs to use such a bot wallet.
In general, there is MyTonWallet or Tonkeeper specifically for TON, which is preferable to using a custodial wallet in Telegram.