yes, you can stop this by going to settings and select the "hide battle results until viewed" option. apparently people will wait until near the end of the timer and then check the blockchain to see if you posted your team. then they can directly counter it.
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That is already enabled to everyone since November I believe.
The new change will conceal the name of your opponent as well, so you can't check their deck, and more then the last 5 fight before selecting your team.
There were new services offering this option like Splintertools.