> any possible excuse to suggest tech companies shouldn't be accountable
The entire impetus for these bills is for Facebook (the sponsor of these bills) to escape liability for how they're currently harming kids. Facebook's only goal here is to be receiving headers that say the user is over 18, so they can continue business as usual under the assertion that any users must be adults.
Then you recognize that the solution definitely does not require privacy invasion, since presumably Facebook does not want actual proof because they hope teenagers will get around it.
That being said, the antiregulatory wonks are not all working for Facebook, and some are indeed manifestly just always opposed to any regulation at all no matter what harm is occurring.
Bear in mind the alternative: Things like Discord collecting personal data to do verification at the website level. A push for a simple "user is over 18" header is incredibly preferable from a privacy standpoint and parents being able to control and monitor it themselves.