[burntoutfire]

> Because of Dark patterns and Javascript. JS makes it hard to scrape unless you have enough processing power to run a browser headless for millions of product websites, and without bombing their sites too hard.

I believe that, at least in Poland, it works the other way around? The price comparison site (ceneo.pl) is so dominant that the vendors have to actually feed it its listings in order to stay in business, as very many people just buys goods through ceneo, and pick whichever store has the good at lowest price at the moment.