Trump and Musk should buy it
First off, all publicly traded stocks are up for sale. That is what publicly traded means. It is amazingly dense that you do not understand that.
trump has almost no money on hand, and no one would ever loan him a huge amount of money to buy the future corporation which will include MSNBC and a dozen other cable networks.
Musk has less money on hand than you would think. He avoids selling things, because that would incur a tax liability. Instead he follows the buy, borrow, die plan, and borrows whatever money he needs using his current assets as collateral.
That is how he funded the buying of Twitter, and almost certainly how he would fund the buying of MSNBC(and company). Actually, CNBC and Scifi are the pearls in that deal. Anyway, the purchase of Twitter went horrible wrong. Musk's creditors have taken severe losses.
Will anyone loan Musk about $30 billion for the cable networks, fully knowing that it will require another $20+ billion to fix them up to have a more modern business plan... And then just be a huge risk? And remember, this would not be equity, where the lenders would have an infinite potential upside, but rather a loan, where the maximum upside is just the principle plus interest.
It just is not going to happen. Musk could sell a major portion of his current portfolio, lose a chunk on taxes, and then invest it in a much lower growing stock, in a field he clearly does not understand. If he does that, we know Musk has really lost his mind.