[2020] how are the moderators handling base stealing?

There is no rule on people not following your commands. Generally communication is always key, but its not punishable if someone decides to ignore chat or doesn't pay attention and just attacks targets.

Best thing to do is keep your own situational awareness and see where you team is going. If after you ping'ed a base, you see someone still making a direct B-line for it, probably means they intend to bomb it.