[AznHisoka]

It would help if Yelp allowed new, emerging search engines (potential google competitors) to crawl their site. But their robots.txt only allows Google, Bing and a few others to crawl them (https://yelp.com/robots.txt)

allow all crawlers and I would have at least a little sympathy for Yelp.

[bdcravens]

Presumably they want a legal defense against scrapers.

[anindha]

There are probably food delivery and restaurant reservation startups complaining that Yelp has a monopoly position on restaurant search.