They should be 100% strictly liable for any lies at all of any form in advertising they show. The media companies can then solve the risk like everybody else b

They should be 100% strictly liable for any lies at all of any form in advertising they show. The media companies can then solve the risk like everybody else by requiring their ad providers to indemnify the media companies for any liability that arises from any lies in the provided ads. If the media companies do not trust the ad providers to have adequate funds to fully indemnify them then they can demand the ad providers to post bonds or insurance demonstrating adequate funds. Alternatively, the media companies can police their ads they display or demand adequate proof for high value ad placements to minimize their risk. They have plenty of bog standard options to mitigate any strict liability risk. And assigning strict liability to the media companies for any lies guarantees any damaged parties full access to relief for any harms enacted on them.