They custom built a database to facilitate an adult classifieds section. Which on its face is not illegal, and the argument it was illegal was based on a technicality related to filtering and word replacement that removed their safe harbor protections. The owners themselves did not know this until the court case was decided years later so it seems weird to presume that Salesforce could know it.

Backpage was shut down before the law went into effect so I assume the Salesforce work was done before the law went into effect as well.