Solution/Question: Could the padmapper guy just make an application, which he sells for $10-$15, with the same functionality, except all the "scraping" happens

Solution/Question: Could the padmapper guy just make an application, which he sells for $10-$15, with the same functionality, except all the "scraping" happens from the user's computer or browser? And if this violates the TOS, assuming I can sell a browser which only visits Craigslist -- then where is the line where a browser does too much "formatting" and becomes a TOS violation?