I think this is a reminder - do not say or do inappropriate things using company resources (chat, email, VPN, etc). Don't complain about co-workers, don't joke about breaking the law, don't say or do anything rude or disrespectful. You'll get about 5 seconds of happiness from a joke that can ruin your career.
I'd blunt that with: It is still appropriate for you to respectfully raise concerns with coworkers, management, etc using company resources. That especially includes if you suspect something may actually be illegal, in violation of a contract etc. Basic human decency and ethics aside, getting fired is still better than going to jail as a scape goat.
> You'll get about 5 seconds of happiness from a joke that can ruin your career.
And your coworkers may gain enough courage to actually stand up publicly against what they all say in private. What a horrendously self-interested take on this whole saga.
