They may fear an anti-trust fight with anything Trump.
Figure strong competition with deep pockets that won't let itself be bought out and techs that can ferret out where cyber attacks against the platform come from.
Best karma scenario for me would be DWAC doing a hostile takeover of Twitter. Pretty sure a Twitter investor wanted Jack gone a year or so ago. Trump would be a formidable ally.
So, Jack has to be very careful. No fuck up will go unpunished.