Advertising works well on local races. But for POTUS, I don't believe it moves the needle much.

The bigger factors are whether the large media players back you (Murdoch, Musk), whether social media personalities back you, and whether the foreign intelligence agencies back you in their spamouflage and information ops (e.g. via the Internet Research Agency).

You don't think the left had all these things in their favor? You think the media are all far right wing conservatives? People like Rachel Maddow and Oprah, you might consider to be much more right wing than even Dick Cheney? You don't think maybe there might be some issues out there that people voted on and maybe saying "I'm a middle class kld" and "I'm speaking" on a loop just didn't do it for them? No, it must be Murdoch, because Soros is a relative pauper by comparison. Really?

That was a factor, but his CV stating "I cut Twitter's expenses and staff by 80%" or however much was probably a big factor too. Of course, he's the only one actually bragging about that being a success.

Twitter's takeover also helped him get a number of loyalist goons that he sent out to various US federal agencies to extract data from.