It's unreasonable to not require a private company to adhere to the law. If you sell hammers, they must meet the laws about hammers, tools, and general goods. I

It's unreasonable to not require a private company to adhere to the law. If you sell hammers, they must meet the laws about hammers, tools, and general goods. If the hammer is unfit for purpose -- say, because the heads are not firmly attached and a user might unwittingly hurt themselves -- that's the company's fault. If the ad selection tools are unfit for purpose -- say because it allows a user to target/untarget recipients in a blatantly illegal manner -- that's the company's fault.