If a newspaper took money to advertise blatant, obvious scams, I assume a judge would consider them at least partially responsible for restitution, if not an accessory to the crime. Looking away really hard (and delegating the task of looking away really hard) shouldn't get you out of this.
Hold the publisher responsible, they can then hold the platform responsible, thus creating a market for platforms that actually fight scams. Right now, there is limited incentive to fight scams, as the scams still drive revenue. If you take money for it, you should be responsible for it.