If you win, they block you and hold your funds hostage (Abusive KYC)
Beware of William Hill Spain. They are incredibly quick to take your deposits, but the second you start making a profit, they restrict your account without warning. They held my money hostage for months using completely abusive and predatory KYC (verification) tactics.
They went as far as demanding materially impossible documents (like a physical photo of a deleted Apple Pay digital token) just to stall the process, feed me automated responses, and frustrate me in the hopes that I would just give up and leave my money on their platform.
They only finally released my funds when I stood my ground, called out their stall tactics, and threatened them with a formal regulatory complaint to the DGOJ. A disgraceful bookmaker. If you are a profitable player, stay far away. They only want losers.