The fact is that the blockchain fee is not the same as the casino’s withdrawal fee. A casino may also have a withdrawal fee even if SUI has no, or very little, network fees. The greater question is whether or not the platform has SUI support in the first place. In the future, it would be interesting to find out if Spinly would continue to maintain a comparable withdrawal fee to other networks if they added SUI in the future. While low network fees are beneficial, they don't necessarily equate to lower withdrawal costs for casino users.
Are you even reading the posts?
Go back one page, me and another member confirmed that there is no SUI support on Spinly, and I confirmed clearly what blockchain is supported for USDT
You can see on the previous page:
SUI blockchain doesn't charge any gas fees on stable coins, it is the fastest and most reliable.
It does not matter if a blockchain charges no fees or is the fastest for stablecoins if they are not supported

Spinly has no SUI blockchain option to withdraw the funds. For USDT they have Ethereum, Tron, Solana and Ton
In any case Spinly has a 0 fee for any network when you withdraw USDT
Ethereum, Tron, Solana and Ton