Not every cryptocurrency gambling websites that offer instant withdrawal you can explain or testify for the one you know better because not all the one you know that is cryptocurrency gambling that do instant withdrawal immediately,, unless it's new one that is looking way forward of getting new costumers. Casino gambling have varieties and it functions due to the rules and regulations of the platform to maintain their reputation
He only mentioned the majority though and not all of the crypto casinos. I know there are still a few casinos that are cautious and delay withdrawal for security reasons but there are old casinos that still have instant withdrawal.
Also, these promo offers on deposits are important too since it will drive the interest of the gamblers, and also make the casinos more alive and very enticing to play.
Back then deposit promos were popular but now most casinos are starting to offer several contests, raffles, and other reward systems as a way to encourage every type of gambler.