It's the mempool being extremely empty these days..........
Whether the withdrawal is slow or instant, freebitco broadcast transactions with a high fee. So, even if the mempool is not that empty, there's a high probability that a slow withdrawal transaction is confirmed very fast.
Actually, the difference between slow and instant withdrawals isn't in the miners fee. The difference is in how long you have to wait for your transaction to be broadcast.
Click
here to see the last slow withdrawal transaction they broadcast. They paid 70 sat/byte.
If you select the instant option, freebitco broadcast your withdrawal transaction very very fast.
If you select the slow option, freebitco will process your withdrawal along with other users withdrawals in a single transaction (with a high fee). Therefore, you have to wait some time for your transaction to be broadcast. This doesn't mean they will make the transaction with a low fee.
No, not only that. Slow withdrawals take 6 to 24 hours normally. It arrived instantly. I didn't choose "instant withdrawal"
There's a high probability that a slow withdrawal request is processed much faster.
In the "slow" tab, you can see the countdown to next payout.
Look at the image below. If you request a slow withdrawal now, the transaction will be made about 1 hour later.