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Avoid them, such brokers can easily pull an exit scam on their customers, charging $8 for fees on USDT withdrawal is insane it will definitely not be sustainable for long and as far as they agree and apologize for the misconception to clear out the assumption of whether they are legit or not and confirm that that broker is definitely not legit and withdraw all your money from there asap.
I agree with you on this and the OP should rather take his funds out from that platform because they’re showing signing of illegitimacy even if the OP said he had withdrew more than 30 times after this incident happened. For a platform to not have a specific withdrawal fees charge and only consenting to customers that voice out means many customers are falling victim of this and paying that high withdrawal fees. They will keep leveraging on their customers during withdrawals to make more money for their services. It is better one do not use them as they show all sign of exiting scam one day if care is not taken.
I don't do stock anymore since one broker team I was using way back made an exit scam on us moving out all the money from the exchange account and leaving investors in tears.
Many scams like this have happened in the past and it is so unfortunate many people fell for it due to lack of proper knowledge about the most probable way to secure their funds. Many served as lessons and many won’t fall victims of such again in the future.