Scraping Data From Another Site To Use On Your Own, Legal?

Any have any knowledge on the legal aspect of this? Say I'm to scrape a lot of data from a site that has user submitted statistics, and use that data to show on my own site. It's a completely unique site, with unique content and unique charts to display the scraped data. I'm basically just using their numbers(like prices, locations, etc), scraping them once and hosting all the data on my site not relying on them. Next to no content is being scraped, just numbers and names.

Right now I just have a methodology page sourcing this site saying we are using some statistics from them combined with another site(which we are). Is this sufficient?

Check their ToS but 99.9% of them don't allow scraping of their data.

It's illegal because it's copyright infringement.
Find sources that allow you to copy them like wikipedia.