Don’t kid yourself. It’s about the $$$
Trump generates a lot of traffic.
I believe you are right.....also I think mark Zuckburg is smart enough to know if you are going to get away with political censorship you do it to the small guy not some one who can fight back... trump at this point as a presidential candidate would cause to big of a possible regulatory blow back with people asking for oversight through laws and the creation agencies he does not want that because he wants to make the decisions with his company on what speech he will allow on his network.
And he probably realizes that is Trump is elected the next president it might not be a good idea to be on his bad side. Trump strikes me as a guy who keeps a list of who his enemies are and aren't.