The only foolproof solution is to remove power from the lobbyists.
Similar to how the Supreme Court releases their final votes but doesn't show people how the deliberations are being done.
From interacting with him and reading the CRI stuff, I learned a lot about how lobbyists will sit in on the bill making process and basically monitor the lawmakers' every move in the negotiation part of the bill.
He said to me once that they were called lobbyists because they used to have to wait in the lobby before they could talk to people, now they get to sit directly in the lawmaking chambers while it's happening.
How do you do this though?
Suppose Facebook wants to gut privacy rules. They control which news stories get prioritized for their users. They express their policy preference in public, then penalize politicians who cross them. Even if politicians pay no attention to this, the ones who cross them are more likely to lose their seats. Assuming politicians aren't too oblivious to notice it, they comply to avoid that, without Facebook ever explicitly threatening them.
The fact that Facebook can send someone into Washington to tell the politicians what they want in person instead of publishing it on their website doesn't really change the math, does it?
And without knowing for certain whether that person actually voted in the committee for X or added X to the bill, it also makes it hard to know whom to intimidate, whom to threaten by being primaried out, whom to defame, etc.