It is more than just briefs. Amici curiae means 'friends of the court'. They are only permitted either by consent of all the actual parties or upon application if the court decides that the prospective amici offers a unique legal perspective. The parties to the litigation are given wide discretion to call witnesses, so you don't need to be an amici for that, just subpoenaed and tendered.
Encode successfully navigated this, by not offering facts (who did what, and when), since they don't have any first-hand knowledge of the facts. What they offered, accordin...
The request to file the amicus brief was denied because the court (rightly) interpreted the content of the brief as purely factual. Without consent of all parties, amici curiae are normally only granted when they are able to offer a unique legal perspective on the matters in dispute between the parties. Going through the proposed brief, it seems that nearly all of the substantive content is factual, being descriptions of processes, statements, and general history. Plainly speaking, this is just inappropriate and has rightly been dismissed.
If Elon wanted th...