alt Hacker NewsYes, we are talking about a communications service, one specifically focusing on political speech.
"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances."
Email, chat, websites, blogs - these are all speech! A/I's overt political statement (that you are indicting them for) points to their primary interest being to facilitate political speech - a type of speech with some of the strongest protections (that whole "assemble ... and petition the Government" thing)
Beyond that, they're presumably a neutral conduit like every other service provider. If some users of their services are communicating to coordinate crimes, then unless A/I is getting directly involved in those conversations (with the government producing hard evidence of this), it's the exact same dynamic as every other email/hosting provider.
There is the absolutely perfect Supreme Court case that ruled against your theory.
Holder v. Humanitarian Law Project https://supreme.justia.com/cases/federal/us/561/1
There is a law (18 U.S.C. § 2339B) that says you cant knowingly provide material support for designated foreign terrorist organizations. A law firm wanted to provide financial support and legal services to some, including the PKK (the same group A/I was accused of helping). They argued the federal law violated their first amendment rights.
The court concludes that the first amendment doesn't protect your ability to provide material support including services and communication equipment and the law still stands today.