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As mentioned before that's how law works. Before the erosion of the federal law protecting manufacturers and sellers of firearms, cases with the very same set of fact would have been dismissed, because there was a law shielding them from liability.

The parties have to be liable for something...and the same would be true with tech companies if their current federal protections were removed, they would have to be liable for some valid legal claims such as negligence, defamation, copyright infringement, trademark infringement.

The point is removing the federal shield the multi-billion dollar companies lobbied for to protect themselves from lawsuits, so when their is an otherwise lawful claim for which they are liable they can be sued.

Honestly, how did you think it works?