This is absolutely pure speculation, but perhaps that is Musk's motive for this whole charade. He is erratic enough that it certainly seems possible that he did this whole acquisition agreement with no intention of following through simply to unveil information to discredit Twitter. It certainly doesn't appear from the outside that Musk had any ideas for making money on this by materially improving Twitter as a business from anything I've read. The justifications about free speech seem to taint this deal with Musk having an ideological bent to the whole transaction, so it seems possible that he thought he could use the buyout to access damaging information (like potentially lying on SEC filings) and then back out without spending the full amount.

Honestly, waiving due-diligence is so sketchy that it has made me wonder from the start what his true endgame was. If he did want to buy the company, what did he gain by waiving his due-diligence rights?