If they can actually enforce these requirements, this will be the primary focus. So, creepers everyday, all day until you pay will get you in trouble. OCR has never restricted a persons ability to play the game if they don't pay so in that aspect we are safe. I think the bit about preferential treatment is just a poorly worded statement, they are not saying we can't give in game bonuses for donating, like is done on the OCR server, just that we can't withhold core game-play until people pay.
I think as it stands now, OCR is in compliance with the rules.