Regarding the Twitter files and, in particular, White House and FBI flagging content/users. When it rises to a 1A violation depends on whether the government used coercion. And what coercion is from a legal standpoint is not always clearcut, particularly due to a somewhat inconsistent line of cases that Genevieve Lakier nicely summarizes here. https://www.lawfareblog.com/informal-government-coercion-and-problem-jawboning

Everyone should worry if a government official uses the power of federal law enforcement or regulation to coerce a platform to take down speech. At the same time, the government can be a participant in the speech marketplace (including criticizing people). The problem is that we have very blurry lines as to what is acceptable. While more modern 1A lines will emerge with caselaw, this also is something where statutes could play a role in bringing clarity.