You treat it as a public-facing building storefront, with you standing outside and taking pictures. As long as there are big glass windows, the patrons and the

You treat it as a public-facing building storefront, with you standing outside and taking pictures. As long as there are big glass windows, the patrons and the information gained from looking inside are not subject to privacy, and are thus freely accessible to anyone walking by. What you're not entitled to is the backend workings of the website - the application/code/databases, and credentials. It would be akin to going into a restaurant and forcing yourself into the food prep area and stealing the owner's keys, and contaminating the food that patrons eat. Scraping too often would be something akin to setting up a camera tripod right in the building entrance, hindering the influx of new customers. While not explicitly illegal, it does hinder the operation of the business, and you will probably be physically removed at some point (this is banning abusive bots, etc.)