To the extent that these separate companies are actually coordinating a takedown of a third party, they could run afoul of anti-racketeering / RICO statutes.
Not that I would hold my breathe waiting for the Department of Justice to press charges.
But private companies do not actually have the right to coordinate takedowns of other companies.
Even if they're talking to each other about it, there's no racketeering or other criminal issue involved when this is the companies enforcing their established ToS. Getting together and saying "hey I think this latest incident really shows we should pay more attention to ToS enforcement" isn't racketeering.
Not that I would hold my breathe waiting for the Department of Justice to press charges.
But private companies do not actually have the right to coordinate takedowns of other companies.