I am not so sure that Bezos, Thiel, and their ilk worry about Trump as POTUS being upset with them for anything, be it endorsing Harris or whatever. They have more power in actual fact than the POTUS does in the domains that matter to them. Legislation comes thru Congress, not the executive branch, and oligarchs own plenty of Congress. I think it was another kind of business decision, in the Washington Post case anyhow. People from all parties and dogmas buy crap from Amazon. Mindless online consumerism crosses all political boundaries. A few eggheads may whine about no endorsement by the WashPost, but it's not going to stop anybody from clicking "buy now!"