You're misunderstanding the implications of "may".
It's not "may or may not".
It's "you are allowed to do this if you want".
If you disagree with the new rules, you MAY (are allowed to) reject them by uninstalling the game. They aren't going to stop you.
If you do not take that option, and continue to play, you are implicitly agreeing to the new rules - as is clearly outlined in the next sentence of the TOS.
There is no option to "continue to play without agreeing". If you haven't signaled your disagreement by leaving, you've agreed.
