How legal is it to parse a store's product catalog?

Question

Parsing

An order has been received - to parse data from the catalogs of Pyaterochka, Krasnoe&White and Magnit stores for later use of this data in a commercial project. You need to parse: price, name, article, weight. The question is, how is this legal? I heard that sort of like parsing without the consent of the "target" is prohibited.

Answer 1

The catalog of goods is a public offer to an indefinite circle of persons. Accordingly, you can familiarize yourself with it, including catalog parsing.
The only thing you need to know the measure - if you bring down the server with a mass of your requests, you make it difficult for others to get to know it, and can cause direct damage to the owner. Let's say others can't enter the catalog or pay for goods while your cool multi-threaded script is loading the server...
And these acts can fall under the provisions of the criminal code.

Answer 2

There is no direct ban, and, as far as I know, it’s generally good practice in business to constantly parse competitors’ public catalogs (remember the campaign “we found it cheaper - we’ll return 110% of the difference”, it works on such parsing).
Another question is what they might take for an attack and block you (along with the subnet), but, again, it is impossible to prove the presence of malicious intent.