Using a discount code you're not entitled to is not technically fraud or illegal, even if the Avis T+C insist it is. Legally, Avis has made no attempt to block or limit access to these codes or change codes that appear online - they could alter the booking system to limit access to profiles that include an email address from that customer's email domain - because access is unrestricted, they cannot claim harm from their use or make a bogus claim the rental was "illegal".

Having said that, Avis could (and will) void any insurance coverage and pass any liability and legal costs to the renter using the code. If the code includes LDW, the credit card will not pay on any damage claim...and of course Avis could place the renter on a DNR list. If the renter is in an accident and creates a liability, the renter is going to have a big problem to deal with unless they have their own auto policy that covers rentals...and this means (regardless of discount code or not) any renter who does not have their own policy and does not purchase additional liability coverage is looking at a potentially HUGE cost in the event of an injury accident as the car rental companies only carry the mandated state minimum coverage.

The safest bet is to use a code that does not include LDW, but if someone does use such a code, they should have their own personal auto policy that covers rental car damage and liability at the same limits as their personal auto and umbrella policies (almost everyone here has an umbrella policy, right? )