I've been building a product search tool. I wanted to scrap data to power it. It'd be similar to the caching and scrapping Google does. But I spoke to a lawy

I've been building a product search tool. I wanted to scrap data to power it. It'd be similar to the caching and scrapping Google does. But I spoke to a lawyer and she strongly advised against it (she said if the Terms of Service of a site say it isn't allowed, you have to follow that). Dunno. Confuses me how something is supposedly illegal yet many companies do all the time without a concern.