I decided to give this casino a try. I placed a bet, it won. I put funds for withdrawal and I have not been able to withdraw for more than a day. If anything changes I will report here.
Based on their terms about withdrawal of funds, they say:
11.1. Due to the workflow of our anti-fraud system, the waiting time for your withdrawal can be prolonged up to the point when all the needed procedures will be conducted to supply a decent level of financial security for users (up to seven (7) days and more if needed).
It is written up to 7 days so you need to wait for more days, maybe they do manual verification for all withdrawals and yours is on the queue.
I tried to find if there is a wagering requirement on deposit without bonus but I did not find it, did you place a single bet only then requested withdrawal?
Usually casinos has 1x wagering requirement on deposit without bonus to avoid money laundering, so if you withdraw after 1 bet only then it can arise a warning to their system to do manual check/verification.