Changing User Permisions from Editor to Participant

I'm going to be switching some user's from an Editor to Participant. 

 

What happens to the cards that this user owns?  Do they still own these cards?  From my understanding a Participant can't create cards so they wouldn't be able to own cards either.

 

Also what other things should I be aware of when making this switch for User's?

Thanks,

 

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