Playershops currently block anyone access who is not a citizen. Loosely, this allowed us to keep F2P accounts from owning a shop. Moving forward, I have put in a few checks for F2P accounts. If you are found as having a F2P account with a shop, you will have up to 30 days to re-subscribe or risk losing your shop. This is addressed in SHOP POLICY # 6:

6) Free to play accounts are not eligible to own a shop. If a free to play account is found to be the owner of a shop they will have up to 30 days to resubscribe. If are unable to do so your shop will be evicted.

Retser, ASGM

That's disappointing. On the test server, I bought a shop and was told by ASGM Retser that it was not a bug, but intended that F2P Citizens could own shops.