I would say
"$50 BTC Welcome Bonus" because people don't get the bonus for depositing alone. It's depositing and playing x amount. But by saying
"$50 BTC Welcome Bonus" its more general thus covers the bonus in its totally more. From there its up to the player to read the requirements for it.
All in all, you guys are doing a great job! Remembering where you came from (just a single Dice game) to what it is now.

Keep it up. I hope the staking feature is released soon. Should give me a lot more dividends I assume

This kind of bonuses are standard thing in fiat casino industry. We are avoiding them in crypto industry as much as possible but it is moving in that direction.
You know what sucks about it? They came in here a month ago, A MONTH AGO and said what should they change the topic name to, they said maybe putting the right thing would be better and realized what would be better, and they even sent a post about it. Look at it a month later, they are still keeping the same topic name and they are still saying "50 dollar free bitcoin sign up bonus" like it is free to take whenever you want when in fact it is nowhere near and definitely wrongful marketing.
I hope they will realize one day that tricking people into coming into the casino is no way of making a long term business, it may get few people who fall for it, but it won't help them in the long term. I don't know who is the marketing guy for this website but he has dropped the ball insane amount of times.