Hello! Again, thank you for all the quality support you guys provide.
This is a distinctive feature. If there was the possibility of restricting it in a paid plan, it would be one more benefit that would lead the user to pay for a plan. I think that the differential resources that you offer can also be seen as tools for the monetization in a plan of sites, as is my case with this ICS resource. 
Thanks for your suggestion, we’ll consider adding this feature.
It will most likely be added via a new monetization extension we plan to release as a replacement for Paid Listings, which will allow restricting access to attribute fields.
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Great! Thank you very much.