Besides topics covered in this semi-rant post previously, I will give one, absolutely cardinal rule on how you will GUARANTEE I will not trial your game.
Do not ask me for my Credit Card information.
A 10 day trial is for me to see if I like your game, not tether me to a possible error and scoop up a free sub month if I get busy and forget to cancel in time.
Give me 10 days free, and then if I want to continue playing, I will give you my CC information. Simple enough.
You would think, anyway.