Do online pharmacies have to build or rent a brick-and-mortar store as part of its business?
Some do have such and it's all to help show that they are legitimate in their business and should be trusted by all means because they can't sell fake pills when it can be traced back to their physical stores. Personally, I ordered mostly from an online pharmacy that has physical stores.
I trust online pharmacies that have got offline stores than those that don't. This is because I know where I can go and lay complaints once there is one needed to be done on it.