I had played all this four games.
And often play.
For the risk assessment,
I think you are right.
Steemslotgames is the easiest to profit,
MAGIC-DICE is the most difficult to profit.

Steemslotgames will have 1 ~ 2 big awards in about 50 times turn.
So automatically turn 50 times, bet 0.1,
IF these 50 rotation, you no big prizes,
Automatically turn 50 times again, can bet 0.2.
The above personal experience is for reference only, and is at your own risk.