1) Ah, the "the rich will leave!" card. The rich won't leave if you fight the problem under an international flag, and all their businesses will be accounted for. Even
if all the rich want to live solely in the Bahama's or Cayman Islands, let them be. If large countries plot together its not like you can't boycott such small countries. Just like almost the entire world has copyright laws. See also #3.
2) The problem is that large companies such as Amazon don't pay tax which by itself is unfair. On top of that, the side effect is that small and medium businesses [on a worldwide scale] cannot compete with them, leading to less competition which is bad for the customer and bad for the economy. And it isn't just Amazon. It is also for example Starbucks, who pay no tax whatsoever whilst local coffee shops diminish.
3) Not addressing the topic of tax avoidance is political unwillingness kept intact by the rich world elite who give breadcrumbs to servants such as Tucker Carlson.
4) Given the conference was visited by billionaire philanthropists who avoid taxes, it was a highly insightful and appropriate comment.
> it was just more hand waving and blaming the ones who have been pillars of industry, creating jobs, products, and economic prosperity.
If you give me billions of USD I can also promise you I will be a pillar of industry, creating jobs, products, and economic prosperity. The lack of these is caused by the inequality. If people wouldn't live in poverty, their happiness would increase, and they'd be more productive in society; not less. Instead, they're being squeezed out.