In the past, most business owners would perhaps quietly donate to a party or candidates, but probably wouldn't hang their ideology out in front of people all day, every day. Think about someone like Warren Buffett. He has political views, but they are not something he's out there loudly airing on a huge platform.
And like I pointed out, these are not just any old "political views". It's extremist stuff that in the past would have gotten you ostracized. I'm old enough to remember Trent Lott losing his Senate leadership position, for instance.
Also, because of "network effects", simply providing content to Twitter makes the site more valuable.
This stuff sold well in the 20s and 30s and contributed to the initial wishy washy US response to the start of WW2. Imagine a priest way more influential than Rush Limbaugh rooting for the 3rd reich. Now imagine a rich Afrikaner who doesn't begrudge their precarious social standing.
Yes, but also much of this was due to Stalin/USSR having alliance/agreement with Germany on attacking Poland. Many/most? US leftists were pacifists until Hitler attacked the USSR.
There have always been business owners who shouted their ideology, and others who were quiet. You might remember some cases more than others, and some have had a louder voice than others, but both go way back.
Have there been any so brazen as Musk, who used his influence to infiltrate our government and usurp the congressional power of the purse directly and illegally?
Details are different, but there have been lots of examples over the years. Andrew Jackson had his "kitchen cabinet". There was https://en.wikipedia.org/wiki/Teapot_Dome_scandal, Watergate. There are plenty of other examples. In large part if something is an example or not depends on your politics - people tend to overlook the mistakes of someone they support.