Can you give an example of how the most eligible buyers might collude in a way that benefits them all equally, so that this would happen?

For me, it's very hard to conceive of any concrete way that would work. It's a brand, some partnerships, and a network of users that would all go to whatever buyer, and would give that buyer a huge benefit over their existing domestic competitors. So under what circumstances would those domestic competitors allow that instead of aggresively trying to secure it for themselves?

I'm open to believing you, I just don't see what you have in mind.

Why do they need to benefit all equally?

Campaign with the president, offer large amounts of money to the presidents campaign, donate huge sums to a small inauguration party, and then just be picked to get it at a deep discount. The entire point of bribes is that corruption let's you get away with things at a lesser cost. You just screw over everyone else except for the bribe receiver.

only very few rich people can mobilize financial and political capital to pull off tiktok purchase.

Larry Ellison (since he is CIA/MIC friendly and tiktok is already running on Oracle cloud)

Zuck has too much conflict to acquire tiktok, but other oligarchs like Musk/bezos/gates can pull it off, given their recent meetings with Trump