This zero fees only applies when a gambler bets with only TON coin, but will have to pay fees when the gambler wants to pay for his bets with other coins like bitcoin?
There is no option to top up your BTC deposit. You can deposit TON, USDT
TON and NOTCOIN. Zero fees for transactions within the platform. Depositing and withdrawing money requires paying a fee for a network transaction. But these are small amounts.

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However, I haven't checked the withdrawal fee yet, as I haven't won yet. When I withdraw, I will write an expensive fee for withdrawal or not. By the way, as you can see in the screenshot, the fee for USDT transactions is lower than for regular tokens (e.g. NOTCOIN) - this is a special TON policy.
The application itself is very simple! There are only three bookmarks. It's even much simpler than the TonStation (which has a lot of nooks and crannies where lifebuoys are hidden). I would describe TON Bet as a mini Polymarket in terms of betting categories, but at the same time with classic odds (this is an important advantage), and not a betting system like on a Polymarket.
edit: I'm not really sure about that, though. This issue can only be clarified by the TON Bet developers.

When you say no kyc hassle, hope it's not just to play bet, but also when a gambler win a substantial amount, I hope TON bet won't ask for kyc before withdrawals are made? It is important to know these things before one decides to gamble on TON bet. Because I have seen scenario where a casino said no kyc at the initial stage, but when gamblers want to make withdrawal they started asking for kyc.
It's not written about KYC anywhere, so I doubt it will be required. However, if I win, I'll check it when withdrawing and write it here.