What constitutes a "unique compilation" is subject to interpretation in a court of law.
Adding/removing/modifying and changing the arrangement or display of items in a dataset sufficiently constitutes a dataset unique from the one Craigslist offers even if it is largely derivative from the Craigslist dataset.
Craigslist could argue a trespass to chattels tort or file a ToS civil suit, but there isn't much they can do to protect a dataset.
The reason Facebook makes Facebook content largely available only to those who are logged in is to hide behind their ToS and prevent scraping whether centralized or distributed.
Adding/removing/modifying and changing the arrangement or display of items in a dataset sufficiently constitutes a dataset unique from the one Craigslist offers even if it is largely derivative from the Craigslist dataset.
Craigslist could argue a trespass to chattels tort or file a ToS civil suit, but there isn't much they can do to protect a dataset.
The reason Facebook makes Facebook content largely available only to those who are logged in is to hide behind their ToS and prevent scraping whether centralized or distributed.