When you signed on to this forum, you agreed to abide by the rules of the forum. If you are held accountable for breaking the rules, there is nothing you can sue over.
From your linked article: "The law requires companies to detail how they reach conclusions about content moderation and stick to those standards consistently, DeSantis said during a press conference on Monday."
As long as the moderators follow the rules and stick to the standards, you have no complaint. This is not a free speech issue. The 1st amendment is there to prevent the gov't from silencing you. It does not apply to private property. It also does not apply when you have agreed to follow the rules set forth by the forums.
Yes, yes, yes, yes, yes, everyone knows all that, WB. What DeSantis is hopefully trying to achieve, is clearly defined rules with boundaries that must be applied to ALL people equally, rather than just singling out those conservative factions that FB or Twitter may not like or agree with. I think he is trying to pin things down better so as to be able to differentiate DISCRIMINATION, applying rules or a different set of rules for one group of people and not others.
More difficult is the fact that while the 1stA holds true for the government, unfortunately what the founders could not have envisioned is a close partnership between government and industry to where increasingly more and more, there is now a gray line between the two. Unfortunately, I've heard of a number of cases where now, the government is hiring and using private contractors to do just that: sinlence or otherwise attack or control groups and individuals it wishes to target as an end-around the constitutional limitations.