You state Craigslist is "unregulated" but there is no regulations for services that act like Craigslist, such as the local newspaper's classified section. If one posts or answers an ad in the newspaper or on Craigslist, and on is cheated, raped, robbed, or killed, that is not the fault of Craigslist or the newspaper.
But, taxis and taxi services are regulated. Uber and Lyft are not complying with those regulations. The drivers are not just advertising with Uber, but are acting as either independent contractors or employees of Uber, just like taxi drivers are either employees or independent contractors of the taxi services. This makes Uber at least partially responsible for the acts and actions of the drivers. The fact that Uber has that $1,000,000 insurance policy listed as a benefit of Uber is tacit admission of the fact.
By failing to state exactly what regulations Craigslist should be following and why, you have admitted you don't know what you are talking about. The industry that Craigslist participates in has very few, if any, regulations while for-hire transportation is regulated at the local and state level, and occasionally at the federal level. You don't what you are talking about because you are ignorant of the regulations that are involved and used a false comparison.
