This does not mean that. This means that if you are a store and you sell something, you are liable.
Is a marketplace of vendors a store? No.
Is a piece of software that enables a vendor a store? No.
Is a store that runs software to host products from distributors a store? Yes. That's Amazon.
Is a marketplace of vendors a store? No. Is a piece of software that enables a vendor a store? No. Is a store that runs software to host products from distributors a store? Yes. That's Amazon.
Slippery slope averted.