i do understand that most promos or bonuses are only activated once the player deposits to the casino. because that's the norm. very rare that you will see a casino giving a welcome bonus being a new registrant without depositing any. usually, you can get freebies via faucets if you want or like in stake you can automatically get small amt of btc, ltc, doge and eth.
The @OP is not forget about freebitco
I always excited if that thing is a freebie, even if that comes from the faucet because that can help me to play and test the game before I deposit some satoshi. It will be no problem if that is a small amount of btc, ltc, doge, and eth.
Yes, freebitco is not sold tickets to national lotteries, but people who are involved in the crypto world know about that site, and I think many of them still buy the tickets to win the satoshi. With the 1 satoshi for 1 ticket, that can attract many people who know crypto to buy the tickets because the price is very tempted to them.